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<pre><span class="sourceLineNo">001</span>/*-<a name="line.1"></a>
<span class="sourceLineNo">002</span> *******************************************************************************<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (c) 2011, 2016 Diamond Light Source Ltd.<a name="line.3"></a>
<span class="sourceLineNo">004</span> * All rights reserved. This program and the accompanying materials<a name="line.4"></a>
<span class="sourceLineNo">005</span> * are made available under the terms of the Eclipse Public License v1.0<a name="line.5"></a>
<span class="sourceLineNo">006</span> * which accompanies this distribution, and is available at<a name="line.6"></a>
<span class="sourceLineNo">007</span> * http://www.eclipse.org/legal/epl-v10.html<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> * Contributors:<a name="line.9"></a>
<span class="sourceLineNo">010</span> *    Peter Chang - initial API and implementation and/or initial documentation<a name="line.10"></a>
<span class="sourceLineNo">011</span> *******************************************************************************/<a name="line.11"></a>
<span class="sourceLineNo">012</span><a name="line.12"></a>
<span class="sourceLineNo">013</span>package org.eclipse.january.dataset;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.util.ArrayList;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.util.Arrays;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.util.Collection;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import java.util.Iterator;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.util.List;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import org.eclipse.january.dataset.Comparisons.Monotonicity;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>/**<a name="line.23"></a>
<span class="sourceLineNo">024</span> * Mathematics class<a name="line.24"></a>
<span class="sourceLineNo">025</span> */<a name="line.25"></a>
<span class="sourceLineNo">026</span>public class Maths extends GeneratedMaths {<a name="line.26"></a>
<span class="sourceLineNo">027</span>        /**<a name="line.27"></a>
<span class="sourceLineNo">028</span>         * Unwrap result from mathematical methods if necessary<a name="line.28"></a>
<span class="sourceLineNo">029</span>         * @param o<a name="line.29"></a>
<span class="sourceLineNo">030</span>         * @param a<a name="line.30"></a>
<span class="sourceLineNo">031</span>         * @return a dataset if a is a dataset or an object of the same class as o<a name="line.31"></a>
<span class="sourceLineNo">032</span>         */<a name="line.32"></a>
<span class="sourceLineNo">033</span>        public static Object unwrap(final Dataset o, final Object a) {<a name="line.33"></a>
<span class="sourceLineNo">034</span>                return a instanceof Dataset ? o : o.getObjectAbs(o.getOffset());<a name="line.34"></a>
<span class="sourceLineNo">035</span>        }<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>        /**<a name="line.37"></a>
<span class="sourceLineNo">038</span>         * Unwrap result from mathematical methods if necessary<a name="line.38"></a>
<span class="sourceLineNo">039</span>         * @param o<a name="line.39"></a>
<span class="sourceLineNo">040</span>         * @param a<a name="line.40"></a>
<span class="sourceLineNo">041</span>         * @return a dataset if either a and b are datasets or an object of the same class as o<a name="line.41"></a>
<span class="sourceLineNo">042</span>         */<a name="line.42"></a>
<span class="sourceLineNo">043</span>        public static Object unwrap(final Dataset o, final Object a, final Object b) {<a name="line.43"></a>
<span class="sourceLineNo">044</span>                return (a instanceof Dataset || b instanceof Dataset) ? o : o.getObjectAbs(o.getOffset());<a name="line.44"></a>
<span class="sourceLineNo">045</span>        }<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>        /**<a name="line.47"></a>
<span class="sourceLineNo">048</span>         * Unwrap result from mathematical methods if necessary<a name="line.48"></a>
<span class="sourceLineNo">049</span>         * @param o<a name="line.49"></a>
<span class="sourceLineNo">050</span>         * @param a<a name="line.50"></a>
<span class="sourceLineNo">051</span>         * @return a dataset if any inputs are datasets or an object of the same class as o<a name="line.51"></a>
<span class="sourceLineNo">052</span>         */<a name="line.52"></a>
<span class="sourceLineNo">053</span>        public static Object unwrap(final Dataset o, final Object... a) {<a name="line.53"></a>
<span class="sourceLineNo">054</span>                boolean isAnyDataset = false;<a name="line.54"></a>
<span class="sourceLineNo">055</span>                for (Object obj : a) {<a name="line.55"></a>
<span class="sourceLineNo">056</span>                        if (obj instanceof Dataset) {<a name="line.56"></a>
<span class="sourceLineNo">057</span>                                isAnyDataset = true;<a name="line.57"></a>
<span class="sourceLineNo">058</span>                                break;<a name="line.58"></a>
<span class="sourceLineNo">059</span>                        }<a name="line.59"></a>
<span class="sourceLineNo">060</span>                }<a name="line.60"></a>
<span class="sourceLineNo">061</span>                return isAnyDataset ? o : o.getObjectAbs(o.getOffset());<a name="line.61"></a>
<span class="sourceLineNo">062</span>        }<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span>        /**<a name="line.64"></a>
<span class="sourceLineNo">065</span>         * @param a<a name="line.65"></a>
<span class="sourceLineNo">066</span>         * @param b<a name="line.66"></a>
<span class="sourceLineNo">067</span>         * @return floor divide of a and b<a name="line.67"></a>
<span class="sourceLineNo">068</span>         */<a name="line.68"></a>
<span class="sourceLineNo">069</span>        public static Dataset floorDivide(final Object a, final Object b) {<a name="line.69"></a>
<span class="sourceLineNo">070</span>                return floorDivide(a, b, null);<a name="line.70"></a>
<span class="sourceLineNo">071</span>        }<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span>        /**<a name="line.73"></a>
<span class="sourceLineNo">074</span>         * @param a<a name="line.74"></a>
<span class="sourceLineNo">075</span>         * @param b<a name="line.75"></a>
<span class="sourceLineNo">076</span>         * @param o output can be null - in which case, a new dataset is created<a name="line.76"></a>
<span class="sourceLineNo">077</span>         * @return floor divide of a and b<a name="line.77"></a>
<span class="sourceLineNo">078</span>         */<a name="line.78"></a>
<span class="sourceLineNo">079</span>        public static Dataset floorDivide(final Object a, final Object b, final Dataset o) {<a name="line.79"></a>
<span class="sourceLineNo">080</span>                return divideTowardsFloor(a, b, o).ifloor();<a name="line.80"></a>
<span class="sourceLineNo">081</span>        }<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>        /**<a name="line.83"></a>
<span class="sourceLineNo">084</span>         * @param a<a name="line.84"></a>
<span class="sourceLineNo">085</span>         * @param b<a name="line.85"></a>
<span class="sourceLineNo">086</span>         * @return floor remainder of a and b<a name="line.86"></a>
<span class="sourceLineNo">087</span>         */<a name="line.87"></a>
<span class="sourceLineNo">088</span>        public static Dataset floorRemainder(final Object a, final Object b) {<a name="line.88"></a>
<span class="sourceLineNo">089</span>                return floorRemainder(a, b, null);<a name="line.89"></a>
<span class="sourceLineNo">090</span>        }<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span>        /**<a name="line.92"></a>
<span class="sourceLineNo">093</span>         * @param a<a name="line.93"></a>
<span class="sourceLineNo">094</span>         * @param b<a name="line.94"></a>
<span class="sourceLineNo">095</span>         * @param o output can be null - in which case, a new dataset is created<a name="line.95"></a>
<span class="sourceLineNo">096</span>         * @return floor remainder of a and b<a name="line.96"></a>
<span class="sourceLineNo">097</span>         */<a name="line.97"></a>
<span class="sourceLineNo">098</span>        public static Dataset floorRemainder(final Object a, final Object b, final Dataset o) {<a name="line.98"></a>
<span class="sourceLineNo">099</span>                Dataset da = a instanceof Dataset ? (Dataset) a : DatasetFactory.createFromObject(a);<a name="line.99"></a>
<span class="sourceLineNo">100</span>                Dataset db = b instanceof Dataset ? (Dataset) b : DatasetFactory.createFromObject(b);<a name="line.100"></a>
<span class="sourceLineNo">101</span>                Dataset dq = floorDivide(da, db);<a name="line.101"></a>
<span class="sourceLineNo">102</span>                dq.imultiply(db);<a name="line.102"></a>
<span class="sourceLineNo">103</span>                return subtract(da, dq, o);<a name="line.103"></a>
<span class="sourceLineNo">104</span>        }<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span>        /**<a name="line.106"></a>
<span class="sourceLineNo">107</span>         * Find reciprocal from dataset<a name="line.107"></a>
<span class="sourceLineNo">108</span>         * @param a<a name="line.108"></a>
<span class="sourceLineNo">109</span>         * @return reciprocal dataset<a name="line.109"></a>
<span class="sourceLineNo">110</span>         */<a name="line.110"></a>
<span class="sourceLineNo">111</span>        public static Dataset reciprocal(final Object a) {<a name="line.111"></a>
<span class="sourceLineNo">112</span>                return reciprocal(a, null);<a name="line.112"></a>
<span class="sourceLineNo">113</span>        }<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span>        /**<a name="line.115"></a>
<span class="sourceLineNo">116</span>         * Find reciprocal from dataset<a name="line.116"></a>
<span class="sourceLineNo">117</span>         * @param a<a name="line.117"></a>
<span class="sourceLineNo">118</span>         * @param o output can be null - in which case, a new dataset is created<a name="line.118"></a>
<span class="sourceLineNo">119</span>         * @return reciprocal dataset<a name="line.119"></a>
<span class="sourceLineNo">120</span>         */<a name="line.120"></a>
<span class="sourceLineNo">121</span>        public static Dataset reciprocal(final Object a, final Dataset o) {<a name="line.121"></a>
<span class="sourceLineNo">122</span>                final Dataset da = a instanceof Dataset ? (Dataset) a : DatasetFactory.createFromObject(a);<a name="line.122"></a>
<span class="sourceLineNo">123</span>                return divide(1, da, o);<a name="line.123"></a>
<span class="sourceLineNo">124</span>        }<a name="line.124"></a>
<span class="sourceLineNo">125</span><a name="line.125"></a>
<span class="sourceLineNo">126</span>        /**<a name="line.126"></a>
<span class="sourceLineNo">127</span>         * abs - absolute value of each element<a name="line.127"></a>
<span class="sourceLineNo">128</span>         * @param a<a name="line.128"></a>
<span class="sourceLineNo">129</span>         * @return dataset<a name="line.129"></a>
<span class="sourceLineNo">130</span>         */<a name="line.130"></a>
<span class="sourceLineNo">131</span>        public static Dataset abs(final Object a) {<a name="line.131"></a>
<span class="sourceLineNo">132</span>                return abs(a, null);<a name="line.132"></a>
<span class="sourceLineNo">133</span>        }<a name="line.133"></a>
<span class="sourceLineNo">134</span><a name="line.134"></a>
<span class="sourceLineNo">135</span>        /**<a name="line.135"></a>
<span class="sourceLineNo">136</span>         * abs - absolute value of each element<a name="line.136"></a>
<span class="sourceLineNo">137</span>         * @param a<a name="line.137"></a>
<span class="sourceLineNo">138</span>         * @param o output can be null - in which case, a new dataset is created<a name="line.138"></a>
<span class="sourceLineNo">139</span>         * @return dataset<a name="line.139"></a>
<span class="sourceLineNo">140</span>         */<a name="line.140"></a>
<span class="sourceLineNo">141</span>        public static Dataset abs(final Object a, final Dataset o) {<a name="line.141"></a>
<span class="sourceLineNo">142</span>                final Dataset da = a instanceof Dataset ? (Dataset) a : DatasetFactory.createFromObject(a);<a name="line.142"></a>
<span class="sourceLineNo">143</span>                final SingleInputBroadcastIterator it = new SingleInputBroadcastIterator(da, o, true, true, false);<a name="line.143"></a>
<span class="sourceLineNo">144</span>                final Dataset result = it.getOutput();<a name="line.144"></a>
<span class="sourceLineNo">145</span>                final int is = result.getElementsPerItem();<a name="line.145"></a>
<span class="sourceLineNo">146</span>                final int dt = result.getDType();<a name="line.146"></a>
<span class="sourceLineNo">147</span>                final int as = da.getElementsPerItem();<a name="line.147"></a>
<span class="sourceLineNo">148</span>        <a name="line.148"></a>
<span class="sourceLineNo">149</span>                switch(dt) {<a name="line.149"></a>
<span class="sourceLineNo">150</span>                case Dataset.INT8:<a name="line.150"></a>
<span class="sourceLineNo">151</span>                        final byte[] oi8data = ((ByteDataset) result).data;<a name="line.151"></a>
<span class="sourceLineNo">152</span>                        it.setOutputDouble(false);<a name="line.152"></a>
<span class="sourceLineNo">153</span>        <a name="line.153"></a>
<span class="sourceLineNo">154</span>                        while (it.hasNext()) {<a name="line.154"></a>
<span class="sourceLineNo">155</span>                                oi8data[it.oIndex] = (byte) Math.abs(it.aLong);<a name="line.155"></a>
<span class="sourceLineNo">156</span>                        }<a name="line.156"></a>
<span class="sourceLineNo">157</span>                        break;<a name="line.157"></a>
<span class="sourceLineNo">158</span>                case Dataset.INT16:<a name="line.158"></a>
<span class="sourceLineNo">159</span>                        final short[] oi16data = ((ShortDataset) result).data;<a name="line.159"></a>
<span class="sourceLineNo">160</span>                        it.setOutputDouble(false);<a name="line.160"></a>
<span class="sourceLineNo">161</span>        <a name="line.161"></a>
<span class="sourceLineNo">162</span>                        while (it.hasNext()) {<a name="line.162"></a>
<span class="sourceLineNo">163</span>                                oi16data[it.oIndex] = (short) Math.abs(it.aLong);<a name="line.163"></a>
<span class="sourceLineNo">164</span>                        }<a name="line.164"></a>
<span class="sourceLineNo">165</span>                        break;<a name="line.165"></a>
<span class="sourceLineNo">166</span>                case Dataset.INT32:<a name="line.166"></a>
<span class="sourceLineNo">167</span>                        final int[] oi32data = ((IntegerDataset) result).data;<a name="line.167"></a>
<span class="sourceLineNo">168</span>                        it.setOutputDouble(false);<a name="line.168"></a>
<span class="sourceLineNo">169</span>        <a name="line.169"></a>
<span class="sourceLineNo">170</span>                        while (it.hasNext()) {<a name="line.170"></a>
<span class="sourceLineNo">171</span>                                oi32data[it.oIndex] = (int) Math.abs(it.aLong);<a name="line.171"></a>
<span class="sourceLineNo">172</span>                        }<a name="line.172"></a>
<span class="sourceLineNo">173</span>                        break;<a name="line.173"></a>
<span class="sourceLineNo">174</span>                case Dataset.INT64:<a name="line.174"></a>
<span class="sourceLineNo">175</span>                        final long[] oi64data = ((LongDataset) result).data;<a name="line.175"></a>
<span class="sourceLineNo">176</span>                        it.setOutputDouble(false);<a name="line.176"></a>
<span class="sourceLineNo">177</span>        <a name="line.177"></a>
<span class="sourceLineNo">178</span>                        while (it.hasNext()) {<a name="line.178"></a>
<span class="sourceLineNo">179</span>                                oi64data[it.oIndex] = Math.abs(it.aLong);<a name="line.179"></a>
<span class="sourceLineNo">180</span>                        }<a name="line.180"></a>
<span class="sourceLineNo">181</span>                        break;<a name="line.181"></a>
<span class="sourceLineNo">182</span>                case Dataset.ARRAYINT8:<a name="line.182"></a>
<span class="sourceLineNo">183</span>                        final byte[] oai8data = ((CompoundByteDataset) result).data;<a name="line.183"></a>
<span class="sourceLineNo">184</span>                        it.setOutputDouble(false);<a name="line.184"></a>
<span class="sourceLineNo">185</span>        <a name="line.185"></a>
<span class="sourceLineNo">186</span>                        if (is == 1) {<a name="line.186"></a>
<span class="sourceLineNo">187</span>                                while (it.hasNext()) {<a name="line.187"></a>
<span class="sourceLineNo">188</span>                                        oai8data[it.oIndex] = (byte) Math.abs(it.aLong);<a name="line.188"></a>
<span class="sourceLineNo">189</span>                                }<a name="line.189"></a>
<span class="sourceLineNo">190</span>                        } else if (as == 1) {<a name="line.190"></a>
<span class="sourceLineNo">191</span>                                while (it.hasNext()) {<a name="line.191"></a>
<span class="sourceLineNo">192</span>                                        byte ox = (byte) Math.abs(it.aLong);<a name="line.192"></a>
<span class="sourceLineNo">193</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.193"></a>
<span class="sourceLineNo">194</span>                                                oai8data[it.oIndex + j] = ox;<a name="line.194"></a>
<span class="sourceLineNo">195</span>                                        }<a name="line.195"></a>
<span class="sourceLineNo">196</span>                                }<a name="line.196"></a>
<span class="sourceLineNo">197</span>                        } else {<a name="line.197"></a>
<span class="sourceLineNo">198</span>                                while (it.hasNext()) {<a name="line.198"></a>
<span class="sourceLineNo">199</span>                                        oai8data[it.oIndex] = (byte) Math.abs(it.aLong);<a name="line.199"></a>
<span class="sourceLineNo">200</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.200"></a>
<span class="sourceLineNo">201</span>                                                oai8data[it.oIndex + j] = (byte) Math.abs(da.getElementLongAbs(it.aIndex + j));<a name="line.201"></a>
<span class="sourceLineNo">202</span>                                        }<a name="line.202"></a>
<span class="sourceLineNo">203</span>                                }<a name="line.203"></a>
<span class="sourceLineNo">204</span>                        }<a name="line.204"></a>
<span class="sourceLineNo">205</span>                        break;<a name="line.205"></a>
<span class="sourceLineNo">206</span>                case Dataset.ARRAYINT16:<a name="line.206"></a>
<span class="sourceLineNo">207</span>                        final short[] oai16data = ((CompoundShortDataset) result).data;<a name="line.207"></a>
<span class="sourceLineNo">208</span>                        it.setOutputDouble(false);<a name="line.208"></a>
<span class="sourceLineNo">209</span>        <a name="line.209"></a>
<span class="sourceLineNo">210</span>                        if (is == 1) {<a name="line.210"></a>
<span class="sourceLineNo">211</span>                                while (it.hasNext()) {<a name="line.211"></a>
<span class="sourceLineNo">212</span>                                        oai16data[it.oIndex] = (short) Math.abs(it.aLong);<a name="line.212"></a>
<span class="sourceLineNo">213</span>                                }<a name="line.213"></a>
<span class="sourceLineNo">214</span>                        } else if (as == 1) {<a name="line.214"></a>
<span class="sourceLineNo">215</span>                                while (it.hasNext()) {<a name="line.215"></a>
<span class="sourceLineNo">216</span>                                        short ox = (short) Math.abs(it.aLong);<a name="line.216"></a>
<span class="sourceLineNo">217</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.217"></a>
<span class="sourceLineNo">218</span>                                                oai16data[it.oIndex + j] = ox;<a name="line.218"></a>
<span class="sourceLineNo">219</span>                                        }<a name="line.219"></a>
<span class="sourceLineNo">220</span>                                }<a name="line.220"></a>
<span class="sourceLineNo">221</span>                        } else {<a name="line.221"></a>
<span class="sourceLineNo">222</span>                                while (it.hasNext()) {<a name="line.222"></a>
<span class="sourceLineNo">223</span>                                        oai16data[it.oIndex] = (short) Math.abs(it.aLong);<a name="line.223"></a>
<span class="sourceLineNo">224</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.224"></a>
<span class="sourceLineNo">225</span>                                                oai16data[it.oIndex + j] = (short) Math.abs(da.getElementLongAbs(it.aIndex + j));<a name="line.225"></a>
<span class="sourceLineNo">226</span>                                        }<a name="line.226"></a>
<span class="sourceLineNo">227</span>                                }<a name="line.227"></a>
<span class="sourceLineNo">228</span>                        }<a name="line.228"></a>
<span class="sourceLineNo">229</span>                        break;<a name="line.229"></a>
<span class="sourceLineNo">230</span>                case Dataset.ARRAYINT32:<a name="line.230"></a>
<span class="sourceLineNo">231</span>                        final int[] oai32data = ((CompoundIntegerDataset) result).data;<a name="line.231"></a>
<span class="sourceLineNo">232</span>                        it.setOutputDouble(false);<a name="line.232"></a>
<span class="sourceLineNo">233</span>        <a name="line.233"></a>
<span class="sourceLineNo">234</span>                        if (is == 1) {<a name="line.234"></a>
<span class="sourceLineNo">235</span>                                while (it.hasNext()) {<a name="line.235"></a>
<span class="sourceLineNo">236</span>                                        oai32data[it.oIndex] = (int) Math.abs(it.aLong);<a name="line.236"></a>
<span class="sourceLineNo">237</span>                                }<a name="line.237"></a>
<span class="sourceLineNo">238</span>                        } else if (as == 1) {<a name="line.238"></a>
<span class="sourceLineNo">239</span>                                while (it.hasNext()) {<a name="line.239"></a>
<span class="sourceLineNo">240</span>                                        int ox = (int) Math.abs(it.aLong);<a name="line.240"></a>
<span class="sourceLineNo">241</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.241"></a>
<span class="sourceLineNo">242</span>                                                oai32data[it.oIndex + j] = ox;<a name="line.242"></a>
<span class="sourceLineNo">243</span>                                        }<a name="line.243"></a>
<span class="sourceLineNo">244</span>                                }<a name="line.244"></a>
<span class="sourceLineNo">245</span>                        } else {<a name="line.245"></a>
<span class="sourceLineNo">246</span>                                while (it.hasNext()) {<a name="line.246"></a>
<span class="sourceLineNo">247</span>                                        oai32data[it.oIndex] = (int) Math.abs(it.aLong);<a name="line.247"></a>
<span class="sourceLineNo">248</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.248"></a>
<span class="sourceLineNo">249</span>                                                oai32data[it.oIndex + j] = (int) Math.abs(da.getElementLongAbs(it.aIndex + j));<a name="line.249"></a>
<span class="sourceLineNo">250</span>                                        }<a name="line.250"></a>
<span class="sourceLineNo">251</span>                                }<a name="line.251"></a>
<span class="sourceLineNo">252</span>                        }<a name="line.252"></a>
<span class="sourceLineNo">253</span>                        break;<a name="line.253"></a>
<span class="sourceLineNo">254</span>                case Dataset.ARRAYINT64:<a name="line.254"></a>
<span class="sourceLineNo">255</span>                        final long[] oai64data = ((CompoundLongDataset) result).data;<a name="line.255"></a>
<span class="sourceLineNo">256</span>                        it.setOutputDouble(false);<a name="line.256"></a>
<span class="sourceLineNo">257</span>        <a name="line.257"></a>
<span class="sourceLineNo">258</span>                        if (is == 1) {<a name="line.258"></a>
<span class="sourceLineNo">259</span>                                while (it.hasNext()) {<a name="line.259"></a>
<span class="sourceLineNo">260</span>                                        oai64data[it.oIndex] = Math.abs(it.aLong);<a name="line.260"></a>
<span class="sourceLineNo">261</span>                                }<a name="line.261"></a>
<span class="sourceLineNo">262</span>                        } else if (as == 1) {<a name="line.262"></a>
<span class="sourceLineNo">263</span>                                while (it.hasNext()) {<a name="line.263"></a>
<span class="sourceLineNo">264</span>                                        long ox = Math.abs(it.aLong);<a name="line.264"></a>
<span class="sourceLineNo">265</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.265"></a>
<span class="sourceLineNo">266</span>                                                oai64data[it.oIndex + j] = ox;<a name="line.266"></a>
<span class="sourceLineNo">267</span>                                        }<a name="line.267"></a>
<span class="sourceLineNo">268</span>                                }<a name="line.268"></a>
<span class="sourceLineNo">269</span>                        } else {<a name="line.269"></a>
<span class="sourceLineNo">270</span>                                while (it.hasNext()) {<a name="line.270"></a>
<span class="sourceLineNo">271</span>                                        oai64data[it.oIndex] = Math.abs(it.aLong);<a name="line.271"></a>
<span class="sourceLineNo">272</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.272"></a>
<span class="sourceLineNo">273</span>                                                oai64data[it.oIndex + j] = Math.abs(da.getElementLongAbs(it.aIndex + j));<a name="line.273"></a>
<span class="sourceLineNo">274</span>                                        }<a name="line.274"></a>
<span class="sourceLineNo">275</span>                                }<a name="line.275"></a>
<span class="sourceLineNo">276</span>                        }<a name="line.276"></a>
<span class="sourceLineNo">277</span>                        break;<a name="line.277"></a>
<span class="sourceLineNo">278</span>                case Dataset.FLOAT32:<a name="line.278"></a>
<span class="sourceLineNo">279</span>                        final float[] of32data = ((FloatDataset) result).data;<a name="line.279"></a>
<span class="sourceLineNo">280</span>                        if (as == 1) {<a name="line.280"></a>
<span class="sourceLineNo">281</span>                                while (it.hasNext()) {<a name="line.281"></a>
<span class="sourceLineNo">282</span>                                        of32data[it.oIndex] = (float) (Math.abs(it.aDouble));<a name="line.282"></a>
<span class="sourceLineNo">283</span>                                }<a name="line.283"></a>
<span class="sourceLineNo">284</span>                        } else {<a name="line.284"></a>
<span class="sourceLineNo">285</span>                                while (it.hasNext()) {<a name="line.285"></a>
<span class="sourceLineNo">286</span>                                        of32data[it.oIndex] = (float) (Math.hypot(it.aDouble, da.getElementDoubleAbs(it.aIndex + 1)));<a name="line.286"></a>
<span class="sourceLineNo">287</span>                                }<a name="line.287"></a>
<span class="sourceLineNo">288</span>                                <a name="line.288"></a>
<span class="sourceLineNo">289</span>                        }<a name="line.289"></a>
<span class="sourceLineNo">290</span>                        break;<a name="line.290"></a>
<span class="sourceLineNo">291</span>                case Dataset.FLOAT64:<a name="line.291"></a>
<span class="sourceLineNo">292</span>                        final double[] of64data = ((DoubleDataset) result).data;<a name="line.292"></a>
<span class="sourceLineNo">293</span>                        if (as == 1) {<a name="line.293"></a>
<span class="sourceLineNo">294</span>                                while (it.hasNext()) {<a name="line.294"></a>
<span class="sourceLineNo">295</span>                                        of64data[it.oIndex] = Math.abs(it.aDouble);<a name="line.295"></a>
<span class="sourceLineNo">296</span>                                }<a name="line.296"></a>
<span class="sourceLineNo">297</span>                        } else {<a name="line.297"></a>
<span class="sourceLineNo">298</span>                                while (it.hasNext()) {<a name="line.298"></a>
<span class="sourceLineNo">299</span>                                        of64data[it.oIndex] = Math.hypot(it.aDouble, da.getElementDoubleAbs(it.aIndex + 1));<a name="line.299"></a>
<span class="sourceLineNo">300</span>                                }<a name="line.300"></a>
<span class="sourceLineNo">301</span>                        }<a name="line.301"></a>
<span class="sourceLineNo">302</span>                        break;<a name="line.302"></a>
<span class="sourceLineNo">303</span>                case Dataset.ARRAYFLOAT32:<a name="line.303"></a>
<span class="sourceLineNo">304</span>                        final float[] oaf32data = ((CompoundFloatDataset) result).data;<a name="line.304"></a>
<span class="sourceLineNo">305</span>                        if (is == 1) {<a name="line.305"></a>
<span class="sourceLineNo">306</span>                                while (it.hasNext()) {<a name="line.306"></a>
<span class="sourceLineNo">307</span>                                        oaf32data[it.oIndex] = (float) (Math.abs(it.aDouble));<a name="line.307"></a>
<span class="sourceLineNo">308</span>                                }<a name="line.308"></a>
<span class="sourceLineNo">309</span>                        } else if (as == 1) {<a name="line.309"></a>
<span class="sourceLineNo">310</span>                                while (it.hasNext()) {<a name="line.310"></a>
<span class="sourceLineNo">311</span>                                        float ox = (float) (Math.abs(it.aDouble));<a name="line.311"></a>
<span class="sourceLineNo">312</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.312"></a>
<span class="sourceLineNo">313</span>                                                oaf32data[it.oIndex + j] = ox;<a name="line.313"></a>
<span class="sourceLineNo">314</span>                                        }<a name="line.314"></a>
<span class="sourceLineNo">315</span>                                }<a name="line.315"></a>
<span class="sourceLineNo">316</span>                        } else {<a name="line.316"></a>
<span class="sourceLineNo">317</span>                                while (it.hasNext()) {<a name="line.317"></a>
<span class="sourceLineNo">318</span>                                        oaf32data[it.oIndex] = (float) Math.abs(it.aDouble);<a name="line.318"></a>
<span class="sourceLineNo">319</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.319"></a>
<span class="sourceLineNo">320</span>                                                oaf32data[it.oIndex + j] = (float) Math.abs(da.getElementDoubleAbs(it.aIndex + j));<a name="line.320"></a>
<span class="sourceLineNo">321</span>                                        }<a name="line.321"></a>
<span class="sourceLineNo">322</span>                                }<a name="line.322"></a>
<span class="sourceLineNo">323</span>                        }<a name="line.323"></a>
<span class="sourceLineNo">324</span>                        break;<a name="line.324"></a>
<span class="sourceLineNo">325</span>                case Dataset.ARRAYFLOAT64:<a name="line.325"></a>
<span class="sourceLineNo">326</span>                        final double[] oaf64data = ((CompoundDoubleDataset) result).data;<a name="line.326"></a>
<span class="sourceLineNo">327</span>                        if (is == 1) {<a name="line.327"></a>
<span class="sourceLineNo">328</span>                                while (it.hasNext()) {<a name="line.328"></a>
<span class="sourceLineNo">329</span>                                        oaf64data[it.oIndex] = Math.abs(it.aDouble);<a name="line.329"></a>
<span class="sourceLineNo">330</span>                                }<a name="line.330"></a>
<span class="sourceLineNo">331</span>                        } else if (as == 1) {<a name="line.331"></a>
<span class="sourceLineNo">332</span>                                while (it.hasNext()) {<a name="line.332"></a>
<span class="sourceLineNo">333</span>                                        final double ix = it.aDouble;<a name="line.333"></a>
<span class="sourceLineNo">334</span>                                        double ox = Math.abs(ix);<a name="line.334"></a>
<span class="sourceLineNo">335</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.335"></a>
<span class="sourceLineNo">336</span>                                                oaf64data[it.oIndex + j] = ox;<a name="line.336"></a>
<span class="sourceLineNo">337</span>                                        }<a name="line.337"></a>
<span class="sourceLineNo">338</span>                                }<a name="line.338"></a>
<span class="sourceLineNo">339</span>                        } else {<a name="line.339"></a>
<span class="sourceLineNo">340</span>                                while (it.hasNext()) {<a name="line.340"></a>
<span class="sourceLineNo">341</span>                                        oaf64data[it.oIndex] = Math.abs(it.aDouble);<a name="line.341"></a>
<span class="sourceLineNo">342</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.342"></a>
<span class="sourceLineNo">343</span>                                                oaf64data[it.oIndex + j] = Math.abs(da.getElementDoubleAbs(it.aIndex + j));<a name="line.343"></a>
<span class="sourceLineNo">344</span>                                        }<a name="line.344"></a>
<span class="sourceLineNo">345</span>                                }<a name="line.345"></a>
<span class="sourceLineNo">346</span>                        }<a name="line.346"></a>
<span class="sourceLineNo">347</span>                        break;<a name="line.347"></a>
<span class="sourceLineNo">348</span>                case Dataset.COMPLEX64:<a name="line.348"></a>
<span class="sourceLineNo">349</span>                        final float[] oc64data = ((ComplexFloatDataset) result).data;<a name="line.349"></a>
<span class="sourceLineNo">350</span>                        if (as == 1) {<a name="line.350"></a>
<span class="sourceLineNo">351</span>                                while (it.hasNext()) {<a name="line.351"></a>
<span class="sourceLineNo">352</span>                                        oc64data[it.oIndex] = (float) Math.abs(it.aDouble);<a name="line.352"></a>
<span class="sourceLineNo">353</span>                                }<a name="line.353"></a>
<span class="sourceLineNo">354</span>                        } else {<a name="line.354"></a>
<span class="sourceLineNo">355</span>                                while (it.hasNext()) {<a name="line.355"></a>
<span class="sourceLineNo">356</span>                                        oc64data[it.oIndex] = (float) Math.hypot(it.aDouble, da.getElementDoubleAbs(it.aIndex + 1));<a name="line.356"></a>
<span class="sourceLineNo">357</span>                                }<a name="line.357"></a>
<span class="sourceLineNo">358</span>                        }<a name="line.358"></a>
<span class="sourceLineNo">359</span>                        break;<a name="line.359"></a>
<span class="sourceLineNo">360</span>                case Dataset.COMPLEX128:<a name="line.360"></a>
<span class="sourceLineNo">361</span>                        final double[] oc128data = ((ComplexDoubleDataset) result).data;<a name="line.361"></a>
<span class="sourceLineNo">362</span>                        if (as == 1) {<a name="line.362"></a>
<span class="sourceLineNo">363</span>                                while (it.hasNext()) {<a name="line.363"></a>
<span class="sourceLineNo">364</span>                                        oc128data[it.oIndex] = Math.abs(it.aDouble);<a name="line.364"></a>
<span class="sourceLineNo">365</span>                                }<a name="line.365"></a>
<span class="sourceLineNo">366</span>                        } else {<a name="line.366"></a>
<span class="sourceLineNo">367</span>                                while (it.hasNext()) {<a name="line.367"></a>
<span class="sourceLineNo">368</span>                                        oc128data[it.oIndex] = Math.hypot(it.aDouble, da.getElementDoubleAbs(it.aIndex + 1));<a name="line.368"></a>
<span class="sourceLineNo">369</span>                                }<a name="line.369"></a>
<span class="sourceLineNo">370</span>                        }<a name="line.370"></a>
<span class="sourceLineNo">371</span>                        break;<a name="line.371"></a>
<span class="sourceLineNo">372</span>                default:<a name="line.372"></a>
<span class="sourceLineNo">373</span>                        throw new IllegalArgumentException("abs supports integer, compound integer, real, compound real, complex datasets only");<a name="line.373"></a>
<span class="sourceLineNo">374</span>                }<a name="line.374"></a>
<span class="sourceLineNo">375</span>        <a name="line.375"></a>
<span class="sourceLineNo">376</span>                addFunctionName(result, "abs");<a name="line.376"></a>
<span class="sourceLineNo">377</span>                return result;<a name="line.377"></a>
<span class="sourceLineNo">378</span>        }<a name="line.378"></a>
<span class="sourceLineNo">379</span><a name="line.379"></a>
<span class="sourceLineNo">380</span>        /**<a name="line.380"></a>
<span class="sourceLineNo">381</span>         * @param a<a name="line.381"></a>
<span class="sourceLineNo">382</span>         * @return a^*, complex conjugate of a<a name="line.382"></a>
<span class="sourceLineNo">383</span>         */<a name="line.383"></a>
<span class="sourceLineNo">384</span>        public static Dataset conjugate(final Object a) {<a name="line.384"></a>
<span class="sourceLineNo">385</span>                return conjugate(a, null);<a name="line.385"></a>
<span class="sourceLineNo">386</span>        }<a name="line.386"></a>
<span class="sourceLineNo">387</span><a name="line.387"></a>
<span class="sourceLineNo">388</span>        /**<a name="line.388"></a>
<span class="sourceLineNo">389</span>         * @param a<a name="line.389"></a>
<span class="sourceLineNo">390</span>         * @param o output can be null - in which case, a new dataset is created<a name="line.390"></a>
<span class="sourceLineNo">391</span>         * @return a^*, complex conjugate of a<a name="line.391"></a>
<span class="sourceLineNo">392</span>         */<a name="line.392"></a>
<span class="sourceLineNo">393</span>        public static Dataset conjugate(final Object a, final Dataset o) {<a name="line.393"></a>
<span class="sourceLineNo">394</span>                final Dataset da = a instanceof Dataset ? (Dataset) a : DatasetFactory.createFromObject(a);<a name="line.394"></a>
<span class="sourceLineNo">395</span>                int at = da.getDType();<a name="line.395"></a>
<span class="sourceLineNo">396</span>                IndexIterator it1 = da.getIterator();<a name="line.396"></a>
<span class="sourceLineNo">397</span><a name="line.397"></a>
<span class="sourceLineNo">398</span>                SingleInputBroadcastIterator it = new SingleInputBroadcastIterator(da, o, true, true, true);<a name="line.398"></a>
<span class="sourceLineNo">399</span>                Dataset result = it.getOutput();<a name="line.399"></a>
<span class="sourceLineNo">400</span><a name="line.400"></a>
<span class="sourceLineNo">401</span>                switch (at) {<a name="line.401"></a>
<span class="sourceLineNo">402</span>                case Dataset.COMPLEX64:<a name="line.402"></a>
<span class="sourceLineNo">403</span>                        float[] c64data = ((ComplexFloatDataset) result).getData();<a name="line.403"></a>
<span class="sourceLineNo">404</span><a name="line.404"></a>
<span class="sourceLineNo">405</span>                        for (int i = 0; it1.hasNext();) {<a name="line.405"></a>
<span class="sourceLineNo">406</span>                                c64data[i++] = (float) da.getElementDoubleAbs(it1.index);<a name="line.406"></a>
<span class="sourceLineNo">407</span>                                c64data[i++] = (float) -da.getElementDoubleAbs(it1.index+1);<a name="line.407"></a>
<span class="sourceLineNo">408</span>                        }<a name="line.408"></a>
<span class="sourceLineNo">409</span>                        result.setName(Operations.bracketIfNecessary(da.getName()).append("^*").toString());<a name="line.409"></a>
<span class="sourceLineNo">410</span>                        break;<a name="line.410"></a>
<span class="sourceLineNo">411</span>                case Dataset.COMPLEX128:<a name="line.411"></a>
<span class="sourceLineNo">412</span>                        double[] c128data = ((ComplexDoubleDataset) result).getData();<a name="line.412"></a>
<span class="sourceLineNo">413</span><a name="line.413"></a>
<span class="sourceLineNo">414</span>                        for (int i = 0; it1.hasNext();) {<a name="line.414"></a>
<span class="sourceLineNo">415</span>                                c128data[i++] = da.getElementDoubleAbs(it1.index);<a name="line.415"></a>
<span class="sourceLineNo">416</span>                                c128data[i++] = -da.getElementDoubleAbs(it1.index+1);<a name="line.416"></a>
<span class="sourceLineNo">417</span>                        }<a name="line.417"></a>
<span class="sourceLineNo">418</span>                        result.setName(Operations.bracketIfNecessary(da.getName()).append("^*").toString());<a name="line.418"></a>
<span class="sourceLineNo">419</span>                        break;<a name="line.419"></a>
<span class="sourceLineNo">420</span>                default:<a name="line.420"></a>
<span class="sourceLineNo">421</span>                        result = da;<a name="line.421"></a>
<span class="sourceLineNo">422</span>                }<a name="line.422"></a>
<span class="sourceLineNo">423</span><a name="line.423"></a>
<span class="sourceLineNo">424</span>                return result;<a name="line.424"></a>
<span class="sourceLineNo">425</span>        }<a name="line.425"></a>
<span class="sourceLineNo">426</span><a name="line.426"></a>
<span class="sourceLineNo">427</span>        /**<a name="line.427"></a>
<span class="sourceLineNo">428</span>         * @param a side of right-angled triangle<a name="line.428"></a>
<span class="sourceLineNo">429</span>         * @param b side of right-angled triangle<a name="line.429"></a>
<span class="sourceLineNo">430</span>         * @return hypotenuse of right-angled triangle: sqrt(a^2 + a^2)<a name="line.430"></a>
<span class="sourceLineNo">431</span>         */<a name="line.431"></a>
<span class="sourceLineNo">432</span>        public static Dataset hypot(final Object a, final Object b) {<a name="line.432"></a>
<span class="sourceLineNo">433</span>                return hypot(a, b, null);<a name="line.433"></a>
<span class="sourceLineNo">434</span>        }<a name="line.434"></a>
<span class="sourceLineNo">435</span><a name="line.435"></a>
<span class="sourceLineNo">436</span>        /**<a name="line.436"></a>
<span class="sourceLineNo">437</span>         * @param a side of right-angled triangle<a name="line.437"></a>
<span class="sourceLineNo">438</span>         * @param b side of right-angled triangle<a name="line.438"></a>
<span class="sourceLineNo">439</span>         * @param o output can be null - in which case, a new dataset is created<a name="line.439"></a>
<span class="sourceLineNo">440</span>         * @return hypotenuse of right-angled triangle: sqrt(a^2 + a^2)<a name="line.440"></a>
<span class="sourceLineNo">441</span>         */<a name="line.441"></a>
<span class="sourceLineNo">442</span>        public static Dataset hypot(final Object a, final Object b, final Dataset o) {<a name="line.442"></a>
<span class="sourceLineNo">443</span>                final Dataset da = a instanceof Dataset ? (Dataset) a : DatasetFactory.createFromObject(a);<a name="line.443"></a>
<span class="sourceLineNo">444</span>                final Dataset db = b instanceof Dataset ? (Dataset) b : DatasetFactory.createFromObject(b);<a name="line.444"></a>
<span class="sourceLineNo">445</span><a name="line.445"></a>
<span class="sourceLineNo">446</span>                final BroadcastIterator it = BroadcastIterator.createIterator(da, db, o, true);<a name="line.446"></a>
<span class="sourceLineNo">447</span>                final Dataset result = it.getOutput();<a name="line.447"></a>
<span class="sourceLineNo">448</span>                final int is = result.getElementsPerItem();<a name="line.448"></a>
<span class="sourceLineNo">449</span>                final int as = da.getElementsPerItem();<a name="line.449"></a>
<span class="sourceLineNo">450</span>                final int bs = db.getElementsPerItem();<a name="line.450"></a>
<span class="sourceLineNo">451</span>                final int dt = result.getDType();<a name="line.451"></a>
<span class="sourceLineNo">452</span>                switch (dt) {<a name="line.452"></a>
<span class="sourceLineNo">453</span>                case Dataset.BOOL:<a name="line.453"></a>
<span class="sourceLineNo">454</span>                        boolean[] bdata = ((BooleanDataset) result).getData();<a name="line.454"></a>
<span class="sourceLineNo">455</span><a name="line.455"></a>
<span class="sourceLineNo">456</span>                        while (it.hasNext()) {<a name="line.456"></a>
<span class="sourceLineNo">457</span>                                bdata[it.oIndex] = Math.hypot(it.aDouble, it.bDouble) != 0;<a name="line.457"></a>
<span class="sourceLineNo">458</span>                        }<a name="line.458"></a>
<span class="sourceLineNo">459</span>                        break;<a name="line.459"></a>
<span class="sourceLineNo">460</span>                case Dataset.INT8:<a name="line.460"></a>
<span class="sourceLineNo">461</span>                        byte[] i8data = ((ByteDataset) result).getData();<a name="line.461"></a>
<span class="sourceLineNo">462</span><a name="line.462"></a>
<span class="sourceLineNo">463</span>                        while (it.hasNext()) {<a name="line.463"></a>
<span class="sourceLineNo">464</span>                                i8data[it.oIndex] = (byte) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.464"></a>
<span class="sourceLineNo">465</span>                        }<a name="line.465"></a>
<span class="sourceLineNo">466</span>                        break;<a name="line.466"></a>
<span class="sourceLineNo">467</span>                case Dataset.INT16:<a name="line.467"></a>
<span class="sourceLineNo">468</span>                        short[] i16data = ((ShortDataset) result).getData();<a name="line.468"></a>
<span class="sourceLineNo">469</span><a name="line.469"></a>
<span class="sourceLineNo">470</span>                        while (it.hasNext()) {<a name="line.470"></a>
<span class="sourceLineNo">471</span>                                i16data[it.oIndex] = (short) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.471"></a>
<span class="sourceLineNo">472</span>                        }<a name="line.472"></a>
<span class="sourceLineNo">473</span>                        break;<a name="line.473"></a>
<span class="sourceLineNo">474</span>                case Dataset.INT32:<a name="line.474"></a>
<span class="sourceLineNo">475</span>                        int[] i32data = ((IntegerDataset) result).getData();<a name="line.475"></a>
<span class="sourceLineNo">476</span>                        <a name="line.476"></a>
<span class="sourceLineNo">477</span>                        while (it.hasNext()) {<a name="line.477"></a>
<span class="sourceLineNo">478</span>                                i32data[it.oIndex] = (int) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.478"></a>
<span class="sourceLineNo">479</span>                        }<a name="line.479"></a>
<span class="sourceLineNo">480</span>                        break;<a name="line.480"></a>
<span class="sourceLineNo">481</span>                case Dataset.INT64:<a name="line.481"></a>
<span class="sourceLineNo">482</span>                        long[] i64data = ((LongDataset) result).getData();<a name="line.482"></a>
<span class="sourceLineNo">483</span><a name="line.483"></a>
<span class="sourceLineNo">484</span>                        while (it.hasNext()) {<a name="line.484"></a>
<span class="sourceLineNo">485</span>                                i64data[it.oIndex] = toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.485"></a>
<span class="sourceLineNo">486</span>                        }<a name="line.486"></a>
<span class="sourceLineNo">487</span>                        break;<a name="line.487"></a>
<span class="sourceLineNo">488</span>                case Dataset.FLOAT32:<a name="line.488"></a>
<span class="sourceLineNo">489</span>                        float[] f32data = ((FloatDataset) result).getData();<a name="line.489"></a>
<span class="sourceLineNo">490</span><a name="line.490"></a>
<span class="sourceLineNo">491</span>                        while (it.hasNext()) {<a name="line.491"></a>
<span class="sourceLineNo">492</span>                                f32data[it.oIndex] = (float) Math.hypot(it.aDouble, it.bDouble);<a name="line.492"></a>
<span class="sourceLineNo">493</span>                        }<a name="line.493"></a>
<span class="sourceLineNo">494</span>                        break;<a name="line.494"></a>
<span class="sourceLineNo">495</span>                case Dataset.FLOAT64:<a name="line.495"></a>
<span class="sourceLineNo">496</span>                        double[] f64data = ((DoubleDataset) result).getData();<a name="line.496"></a>
<span class="sourceLineNo">497</span><a name="line.497"></a>
<span class="sourceLineNo">498</span>                        while (it.hasNext()) {<a name="line.498"></a>
<span class="sourceLineNo">499</span>                                f64data[it.oIndex] = Math.hypot(it.aDouble, it.bDouble);<a name="line.499"></a>
<span class="sourceLineNo">500</span>                        }<a name="line.500"></a>
<span class="sourceLineNo">501</span>                        break;<a name="line.501"></a>
<span class="sourceLineNo">502</span>                case Dataset.ARRAYINT8:<a name="line.502"></a>
<span class="sourceLineNo">503</span>                        byte[] ai8data = ((CompoundByteDataset) result).getData();<a name="line.503"></a>
<span class="sourceLineNo">504</span><a name="line.504"></a>
<span class="sourceLineNo">505</span>                        if (is == 1) {<a name="line.505"></a>
<span class="sourceLineNo">506</span>                                while (it.hasNext()) {<a name="line.506"></a>
<span class="sourceLineNo">507</span>                                        ai8data[it.oIndex] = (byte) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.507"></a>
<span class="sourceLineNo">508</span>                                }<a name="line.508"></a>
<span class="sourceLineNo">509</span>                        } else if (as == 1) {<a name="line.509"></a>
<span class="sourceLineNo">510</span>                                while (it.hasNext()) {<a name="line.510"></a>
<span class="sourceLineNo">511</span>                                        ai8data[it.oIndex] = (byte) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.511"></a>
<span class="sourceLineNo">512</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.512"></a>
<span class="sourceLineNo">513</span>                                                ai8data[it.oIndex + j] = (byte) toLong(Math.hypot(it.aDouble, db.getElementDoubleAbs(it.bIndex + j)));<a name="line.513"></a>
<span class="sourceLineNo">514</span>                                        }<a name="line.514"></a>
<span class="sourceLineNo">515</span>                                }<a name="line.515"></a>
<span class="sourceLineNo">516</span>                        } else if (bs == 1) {<a name="line.516"></a>
<span class="sourceLineNo">517</span>                                while (it.hasNext()) {<a name="line.517"></a>
<span class="sourceLineNo">518</span>                                        ai8data[it.oIndex] = (byte) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.518"></a>
<span class="sourceLineNo">519</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.519"></a>
<span class="sourceLineNo">520</span>                                                ai8data[it.oIndex + j] = (byte) toLong(Math.hypot(da.getElementDoubleAbs(it.aIndex + j), it.bDouble));<a name="line.520"></a>
<span class="sourceLineNo">521</span>                                        }<a name="line.521"></a>
<span class="sourceLineNo">522</span>                                }<a name="line.522"></a>
<span class="sourceLineNo">523</span>                        } else {<a name="line.523"></a>
<span class="sourceLineNo">524</span>                                while (it.hasNext()) {<a name="line.524"></a>
<span class="sourceLineNo">525</span>                                        ai8data[it.oIndex] = (byte) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.525"></a>
<span class="sourceLineNo">526</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.526"></a>
<span class="sourceLineNo">527</span>                                                ai8data[it.oIndex + j] = (byte) toLong(Math.hypot(da.getElementDoubleAbs(it.aIndex + j), db.getElementDoubleAbs(it.bIndex + j)));<a name="line.527"></a>
<span class="sourceLineNo">528</span>                                        }<a name="line.528"></a>
<span class="sourceLineNo">529</span>                                }<a name="line.529"></a>
<span class="sourceLineNo">530</span>                        }<a name="line.530"></a>
<span class="sourceLineNo">531</span>                        break;<a name="line.531"></a>
<span class="sourceLineNo">532</span>                case Dataset.ARRAYINT16:<a name="line.532"></a>
<span class="sourceLineNo">533</span>                        short[] ai16data = ((CompoundShortDataset) result).getData();<a name="line.533"></a>
<span class="sourceLineNo">534</span><a name="line.534"></a>
<span class="sourceLineNo">535</span>                        if (is == 1) {<a name="line.535"></a>
<span class="sourceLineNo">536</span>                                while (it.hasNext()) {<a name="line.536"></a>
<span class="sourceLineNo">537</span>                                        ai16data[it.oIndex] = (short) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.537"></a>
<span class="sourceLineNo">538</span>                                }<a name="line.538"></a>
<span class="sourceLineNo">539</span>                        } else if (as == 1) {<a name="line.539"></a>
<span class="sourceLineNo">540</span>                                while (it.hasNext()) {<a name="line.540"></a>
<span class="sourceLineNo">541</span>                                        ai16data[it.oIndex] = (short) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.541"></a>
<span class="sourceLineNo">542</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.542"></a>
<span class="sourceLineNo">543</span>                                                ai16data[it.oIndex + j] = (short) toLong(Math.hypot(it.aDouble, db.getElementDoubleAbs(it.bIndex + j)));<a name="line.543"></a>
<span class="sourceLineNo">544</span>                                        }<a name="line.544"></a>
<span class="sourceLineNo">545</span>                                }<a name="line.545"></a>
<span class="sourceLineNo">546</span>                        } else if (bs == 1) {<a name="line.546"></a>
<span class="sourceLineNo">547</span>                                while (it.hasNext()) {<a name="line.547"></a>
<span class="sourceLineNo">548</span>                                        ai16data[it.oIndex] = (short) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.548"></a>
<span class="sourceLineNo">549</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.549"></a>
<span class="sourceLineNo">550</span>                                                ai16data[it.oIndex + j] = (short) toLong(Math.hypot(da.getElementDoubleAbs(it.aIndex + j), it.bDouble));<a name="line.550"></a>
<span class="sourceLineNo">551</span>                                        }<a name="line.551"></a>
<span class="sourceLineNo">552</span>                                }<a name="line.552"></a>
<span class="sourceLineNo">553</span>                        } else {<a name="line.553"></a>
<span class="sourceLineNo">554</span>                                while (it.hasNext()) {<a name="line.554"></a>
<span class="sourceLineNo">555</span>                                        ai16data[it.oIndex] = (short) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.555"></a>
<span class="sourceLineNo">556</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.556"></a>
<span class="sourceLineNo">557</span>                                                ai16data[it.oIndex + j] = (short) toLong(Math.hypot(da.getElementDoubleAbs(it.aIndex + j), db.getElementDoubleAbs(it.bIndex + j)));<a name="line.557"></a>
<span class="sourceLineNo">558</span>                                        }<a name="line.558"></a>
<span class="sourceLineNo">559</span>                                }<a name="line.559"></a>
<span class="sourceLineNo">560</span>                        }<a name="line.560"></a>
<span class="sourceLineNo">561</span>                        break;<a name="line.561"></a>
<span class="sourceLineNo">562</span>                case Dataset.ARRAYINT32:<a name="line.562"></a>
<span class="sourceLineNo">563</span>                        int[] ai32data = ((CompoundIntegerDataset) result).getData();<a name="line.563"></a>
<span class="sourceLineNo">564</span><a name="line.564"></a>
<span class="sourceLineNo">565</span>                        if (is == 1) {<a name="line.565"></a>
<span class="sourceLineNo">566</span>                                while (it.hasNext()) {<a name="line.566"></a>
<span class="sourceLineNo">567</span>                                        ai32data[it.oIndex] = (int) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.567"></a>
<span class="sourceLineNo">568</span>                                }<a name="line.568"></a>
<span class="sourceLineNo">569</span>                        } else if (as == 1) {<a name="line.569"></a>
<span class="sourceLineNo">570</span>                                while (it.hasNext()) {<a name="line.570"></a>
<span class="sourceLineNo">571</span>                                        ai32data[it.oIndex] = (int) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.571"></a>
<span class="sourceLineNo">572</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.572"></a>
<span class="sourceLineNo">573</span>                                                ai32data[it.oIndex + j] = (int) toLong(Math.hypot(it.aDouble, db.getElementDoubleAbs(it.bIndex + j)));<a name="line.573"></a>
<span class="sourceLineNo">574</span>                                        }<a name="line.574"></a>
<span class="sourceLineNo">575</span>                                }<a name="line.575"></a>
<span class="sourceLineNo">576</span>                        } else if (bs == 1) {<a name="line.576"></a>
<span class="sourceLineNo">577</span>                                while (it.hasNext()) {<a name="line.577"></a>
<span class="sourceLineNo">578</span>                                        ai32data[it.oIndex] = (int) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.578"></a>
<span class="sourceLineNo">579</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.579"></a>
<span class="sourceLineNo">580</span>                                                ai32data[it.oIndex + j] = (int) toLong(Math.hypot(da.getElementDoubleAbs(it.aIndex + j), it.bDouble));<a name="line.580"></a>
<span class="sourceLineNo">581</span>                                        }<a name="line.581"></a>
<span class="sourceLineNo">582</span>                                }<a name="line.582"></a>
<span class="sourceLineNo">583</span>                        } else {<a name="line.583"></a>
<span class="sourceLineNo">584</span>                                while (it.hasNext()) {<a name="line.584"></a>
<span class="sourceLineNo">585</span>                                        ai32data[it.oIndex] = (int) toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.585"></a>
<span class="sourceLineNo">586</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.586"></a>
<span class="sourceLineNo">587</span>                                                ai32data[it.oIndex + j] = (int) toLong(Math.hypot(da.getElementDoubleAbs(it.aIndex + j), db.getElementDoubleAbs(it.bIndex + j)));<a name="line.587"></a>
<span class="sourceLineNo">588</span>                                        }<a name="line.588"></a>
<span class="sourceLineNo">589</span>                                }<a name="line.589"></a>
<span class="sourceLineNo">590</span>                        }<a name="line.590"></a>
<span class="sourceLineNo">591</span>                        break;<a name="line.591"></a>
<span class="sourceLineNo">592</span>                case Dataset.ARRAYINT64:<a name="line.592"></a>
<span class="sourceLineNo">593</span>                        long[] ai64data = ((CompoundLongDataset) result).getData();<a name="line.593"></a>
<span class="sourceLineNo">594</span><a name="line.594"></a>
<span class="sourceLineNo">595</span>                        if (is == 1) {<a name="line.595"></a>
<span class="sourceLineNo">596</span>                                while (it.hasNext()) {<a name="line.596"></a>
<span class="sourceLineNo">597</span>                                        ai64data[it.oIndex] = toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.597"></a>
<span class="sourceLineNo">598</span>                                }<a name="line.598"></a>
<span class="sourceLineNo">599</span>                        } else if (as == 1) {<a name="line.599"></a>
<span class="sourceLineNo">600</span>                                while (it.hasNext()) {<a name="line.600"></a>
<span class="sourceLineNo">601</span>                                        ai64data[it.oIndex] = toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.601"></a>
<span class="sourceLineNo">602</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.602"></a>
<span class="sourceLineNo">603</span>                                                ai64data[it.oIndex + j] = toLong(Math.hypot(it.aDouble, db.getElementDoubleAbs(it.bIndex + j)));<a name="line.603"></a>
<span class="sourceLineNo">604</span>                                        }<a name="line.604"></a>
<span class="sourceLineNo">605</span>                                }<a name="line.605"></a>
<span class="sourceLineNo">606</span>                        } else if (bs == 1) {<a name="line.606"></a>
<span class="sourceLineNo">607</span>                                while (it.hasNext()) {<a name="line.607"></a>
<span class="sourceLineNo">608</span>                                        ai64data[it.oIndex] = toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.608"></a>
<span class="sourceLineNo">609</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.609"></a>
<span class="sourceLineNo">610</span>                                                ai64data[it.oIndex + j] = toLong(Math.hypot(da.getElementDoubleAbs(it.aIndex + j), it.bDouble));<a name="line.610"></a>
<span class="sourceLineNo">611</span>                                        }<a name="line.611"></a>
<span class="sourceLineNo">612</span>                                }<a name="line.612"></a>
<span class="sourceLineNo">613</span>                        } else {<a name="line.613"></a>
<span class="sourceLineNo">614</span>                                while (it.hasNext()) {<a name="line.614"></a>
<span class="sourceLineNo">615</span>                                        ai64data[it.oIndex] = toLong(Math.hypot(it.aDouble, it.bDouble));<a name="line.615"></a>
<span class="sourceLineNo">616</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.616"></a>
<span class="sourceLineNo">617</span>                                                ai64data[it.oIndex + j] = toLong(Math.hypot(da.getElementDoubleAbs(it.aIndex + j), db.getElementDoubleAbs(it.bIndex + j)));<a name="line.617"></a>
<span class="sourceLineNo">618</span>                                        }<a name="line.618"></a>
<span class="sourceLineNo">619</span>                                }<a name="line.619"></a>
<span class="sourceLineNo">620</span>                        }<a name="line.620"></a>
<span class="sourceLineNo">621</span>                        break;<a name="line.621"></a>
<span class="sourceLineNo">622</span>                case Dataset.ARRAYFLOAT32:<a name="line.622"></a>
<span class="sourceLineNo">623</span>                        float[] a32data = ((CompoundFloatDataset) result).getData();<a name="line.623"></a>
<span class="sourceLineNo">624</span><a name="line.624"></a>
<span class="sourceLineNo">625</span>                        if (is == 1) {<a name="line.625"></a>
<span class="sourceLineNo">626</span>                                while (it.hasNext()) {<a name="line.626"></a>
<span class="sourceLineNo">627</span>                                        a32data[it.oIndex] = (float) Math.hypot(it.aDouble, it.bDouble);<a name="line.627"></a>
<span class="sourceLineNo">628</span>                                }<a name="line.628"></a>
<span class="sourceLineNo">629</span>                        } else if (as == 1) {<a name="line.629"></a>
<span class="sourceLineNo">630</span>                                while (it.hasNext()) {<a name="line.630"></a>
<span class="sourceLineNo">631</span>                                        a32data[it.oIndex] = (float) Math.hypot(it.aDouble, it.bDouble);<a name="line.631"></a>
<span class="sourceLineNo">632</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.632"></a>
<span class="sourceLineNo">633</span>                                                a32data[it.oIndex + j] = (float) Math.hypot(it.aDouble, db.getElementDoubleAbs(it.bIndex + j));<a name="line.633"></a>
<span class="sourceLineNo">634</span>                                        }<a name="line.634"></a>
<span class="sourceLineNo">635</span>                                }<a name="line.635"></a>
<span class="sourceLineNo">636</span>                        } else if (bs == 1) {<a name="line.636"></a>
<span class="sourceLineNo">637</span>                                while (it.hasNext()) {<a name="line.637"></a>
<span class="sourceLineNo">638</span>                                        a32data[it.oIndex] = (float) Math.hypot(it.aDouble, it.bDouble);<a name="line.638"></a>
<span class="sourceLineNo">639</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.639"></a>
<span class="sourceLineNo">640</span>                                                a32data[it.oIndex + j] = (float) Math.hypot(da.getElementDoubleAbs(it.aIndex + j), it.bDouble);<a name="line.640"></a>
<span class="sourceLineNo">641</span>                                        }<a name="line.641"></a>
<span class="sourceLineNo">642</span>                                }<a name="line.642"></a>
<span class="sourceLineNo">643</span>                        } else {<a name="line.643"></a>
<span class="sourceLineNo">644</span>                                while (it.hasNext()) {<a name="line.644"></a>
<span class="sourceLineNo">645</span>                                        a32data[it.oIndex] = (float) Math.hypot(it.aDouble, it.bDouble);<a name="line.645"></a>
<span class="sourceLineNo">646</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.646"></a>
<span class="sourceLineNo">647</span>                                                a32data[it.oIndex + j] = (float) Math.hypot(da.getElementDoubleAbs(it.aIndex + j), db.getElementDoubleAbs(it.bIndex + j));<a name="line.647"></a>
<span class="sourceLineNo">648</span>                                        }<a name="line.648"></a>
<span class="sourceLineNo">649</span>                                }<a name="line.649"></a>
<span class="sourceLineNo">650</span>                        }<a name="line.650"></a>
<span class="sourceLineNo">651</span>                        break;<a name="line.651"></a>
<span class="sourceLineNo">652</span>                case Dataset.ARRAYFLOAT64:<a name="line.652"></a>
<span class="sourceLineNo">653</span>                        double[] a64data = ((CompoundDoubleDataset) result).getData();<a name="line.653"></a>
<span class="sourceLineNo">654</span><a name="line.654"></a>
<span class="sourceLineNo">655</span>                        if (is == 1) {<a name="line.655"></a>
<span class="sourceLineNo">656</span>                                while (it.hasNext()) {<a name="line.656"></a>
<span class="sourceLineNo">657</span>                                        a64data[it.oIndex] = Math.hypot(it.aDouble, it.bDouble);<a name="line.657"></a>
<span class="sourceLineNo">658</span>                                }<a name="line.658"></a>
<span class="sourceLineNo">659</span>                        } else if (as == 1) {<a name="line.659"></a>
<span class="sourceLineNo">660</span>                                while (it.hasNext()) {<a name="line.660"></a>
<span class="sourceLineNo">661</span>                                        a64data[it.oIndex] = Math.hypot(it.aDouble, it.bDouble);<a name="line.661"></a>
<span class="sourceLineNo">662</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.662"></a>
<span class="sourceLineNo">663</span>                                                a64data[it.oIndex + j] = Math.hypot(it.aDouble, db.getElementDoubleAbs(it.bIndex + j));<a name="line.663"></a>
<span class="sourceLineNo">664</span>                                        }<a name="line.664"></a>
<span class="sourceLineNo">665</span>                                }<a name="line.665"></a>
<span class="sourceLineNo">666</span>                        } else if (bs == 1) {<a name="line.666"></a>
<span class="sourceLineNo">667</span>                                while (it.hasNext()) {<a name="line.667"></a>
<span class="sourceLineNo">668</span>                                        a64data[it.oIndex] = Math.hypot(it.aDouble, it.bDouble);<a name="line.668"></a>
<span class="sourceLineNo">669</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.669"></a>
<span class="sourceLineNo">670</span>                                                a64data[it.oIndex + j] = Math.hypot(da.getElementDoubleAbs(it.aIndex + j), it.bDouble);<a name="line.670"></a>
<span class="sourceLineNo">671</span>                                        }<a name="line.671"></a>
<span class="sourceLineNo">672</span>                                }<a name="line.672"></a>
<span class="sourceLineNo">673</span>                        } else {<a name="line.673"></a>
<span class="sourceLineNo">674</span>                                while (it.hasNext()) {<a name="line.674"></a>
<span class="sourceLineNo">675</span>                                        a64data[it.oIndex] = Math.hypot(it.aDouble, it.bDouble);<a name="line.675"></a>
<span class="sourceLineNo">676</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.676"></a>
<span class="sourceLineNo">677</span>                                                a64data[it.oIndex + j] = Math.hypot(da.getElementDoubleAbs(it.aIndex + j), db.getElementDoubleAbs(it.bIndex + j));<a name="line.677"></a>
<span class="sourceLineNo">678</span>                                        }<a name="line.678"></a>
<span class="sourceLineNo">679</span>                                }<a name="line.679"></a>
<span class="sourceLineNo">680</span>                        }<a name="line.680"></a>
<span class="sourceLineNo">681</span>                        break;<a name="line.681"></a>
<span class="sourceLineNo">682</span>                default:<a name="line.682"></a>
<span class="sourceLineNo">683</span>                        throw new UnsupportedOperationException("hypot does not support this dataset type");<a name="line.683"></a>
<span class="sourceLineNo">684</span>                }<a name="line.684"></a>
<span class="sourceLineNo">685</span><a name="line.685"></a>
<span class="sourceLineNo">686</span>                addFunctionName(da, db, result, "hypot");<a name="line.686"></a>
<span class="sourceLineNo">687</span><a name="line.687"></a>
<span class="sourceLineNo">688</span>                return result;<a name="line.688"></a>
<span class="sourceLineNo">689</span>        }<a name="line.689"></a>
<span class="sourceLineNo">690</span><a name="line.690"></a>
<span class="sourceLineNo">691</span>        /**<a name="line.691"></a>
<span class="sourceLineNo">692</span>         * @param a opposite side of right-angled triangle<a name="line.692"></a>
<span class="sourceLineNo">693</span>         * @param b adjacent side of right-angled triangle<a name="line.693"></a>
<span class="sourceLineNo">694</span>         * @return angle of triangle: atan(b/a)<a name="line.694"></a>
<span class="sourceLineNo">695</span>         */<a name="line.695"></a>
<span class="sourceLineNo">696</span>        public static Dataset arctan2(final Object a, final Object b) {<a name="line.696"></a>
<span class="sourceLineNo">697</span>                return arctan2(a, b, null);<a name="line.697"></a>
<span class="sourceLineNo">698</span>        }<a name="line.698"></a>
<span class="sourceLineNo">699</span><a name="line.699"></a>
<span class="sourceLineNo">700</span>        /**<a name="line.700"></a>
<span class="sourceLineNo">701</span>         * @param a opposite side of right-angled triangle<a name="line.701"></a>
<span class="sourceLineNo">702</span>         * @param b adjacent side of right-angled triangle<a name="line.702"></a>
<span class="sourceLineNo">703</span>         * @param o output can be null - in which case, a new dataset is created<a name="line.703"></a>
<span class="sourceLineNo">704</span>         * @return angle of triangle: atan(b/a)<a name="line.704"></a>
<span class="sourceLineNo">705</span>         */<a name="line.705"></a>
<span class="sourceLineNo">706</span>        public static Dataset arctan2(final Object a, final Object b, final Dataset o) {<a name="line.706"></a>
<span class="sourceLineNo">707</span>                final Dataset da = a instanceof Dataset ? (Dataset) a : DatasetFactory.createFromObject(a);<a name="line.707"></a>
<span class="sourceLineNo">708</span>                final Dataset db = b instanceof Dataset ? (Dataset) b : DatasetFactory.createFromObject(b);<a name="line.708"></a>
<span class="sourceLineNo">709</span><a name="line.709"></a>
<span class="sourceLineNo">710</span>                final BroadcastIterator it = BroadcastIterator.createIterator(da, db, o, true);<a name="line.710"></a>
<span class="sourceLineNo">711</span>                final Dataset result = it.getOutput();<a name="line.711"></a>
<span class="sourceLineNo">712</span>                final int is = result.getElementsPerItem();<a name="line.712"></a>
<span class="sourceLineNo">713</span>                final int as = da.getElementsPerItem();<a name="line.713"></a>
<span class="sourceLineNo">714</span>                final int bs = db.getElementsPerItem();<a name="line.714"></a>
<span class="sourceLineNo">715</span>                final int dt = result.getDType();<a name="line.715"></a>
<span class="sourceLineNo">716</span>                switch (dt) {<a name="line.716"></a>
<span class="sourceLineNo">717</span>                case Dataset.BOOL:<a name="line.717"></a>
<span class="sourceLineNo">718</span>                        boolean[] bdata = ((BooleanDataset) result).getData();<a name="line.718"></a>
<span class="sourceLineNo">719</span><a name="line.719"></a>
<span class="sourceLineNo">720</span>                        while (it.hasNext()) {<a name="line.720"></a>
<span class="sourceLineNo">721</span>                                bdata[it.oIndex] = Math.atan2(it.aDouble, it.bDouble) != 0;<a name="line.721"></a>
<span class="sourceLineNo">722</span>                        }<a name="line.722"></a>
<span class="sourceLineNo">723</span>                        break;<a name="line.723"></a>
<span class="sourceLineNo">724</span>                case Dataset.INT8:<a name="line.724"></a>
<span class="sourceLineNo">725</span>                        byte[] i8data = ((ByteDataset) result).getData();<a name="line.725"></a>
<span class="sourceLineNo">726</span><a name="line.726"></a>
<span class="sourceLineNo">727</span>                        while (it.hasNext()) {<a name="line.727"></a>
<span class="sourceLineNo">728</span>                                i8data[it.oIndex] = (byte) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.728"></a>
<span class="sourceLineNo">729</span>                        }<a name="line.729"></a>
<span class="sourceLineNo">730</span>                        break;<a name="line.730"></a>
<span class="sourceLineNo">731</span>                case Dataset.INT16:<a name="line.731"></a>
<span class="sourceLineNo">732</span>                        short[] i16data = ((ShortDataset) result).getData();<a name="line.732"></a>
<span class="sourceLineNo">733</span><a name="line.733"></a>
<span class="sourceLineNo">734</span>                        while (it.hasNext()) {<a name="line.734"></a>
<span class="sourceLineNo">735</span>                                i16data[it.oIndex] = (short) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.735"></a>
<span class="sourceLineNo">736</span>                        }<a name="line.736"></a>
<span class="sourceLineNo">737</span>                        break;<a name="line.737"></a>
<span class="sourceLineNo">738</span>                case Dataset.INT32:<a name="line.738"></a>
<span class="sourceLineNo">739</span>                        int[] i32data = ((IntegerDataset) result).getData();<a name="line.739"></a>
<span class="sourceLineNo">740</span>                        <a name="line.740"></a>
<span class="sourceLineNo">741</span>                        while (it.hasNext()) {<a name="line.741"></a>
<span class="sourceLineNo">742</span>                                i32data[it.oIndex] = (int) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.742"></a>
<span class="sourceLineNo">743</span>                        }<a name="line.743"></a>
<span class="sourceLineNo">744</span>                        break;<a name="line.744"></a>
<span class="sourceLineNo">745</span>                case Dataset.INT64:<a name="line.745"></a>
<span class="sourceLineNo">746</span>                        long[] i64data = ((LongDataset) result).getData();<a name="line.746"></a>
<span class="sourceLineNo">747</span><a name="line.747"></a>
<span class="sourceLineNo">748</span>                        while (it.hasNext()) {<a name="line.748"></a>
<span class="sourceLineNo">749</span>                                i64data[it.oIndex] = toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.749"></a>
<span class="sourceLineNo">750</span>                        }<a name="line.750"></a>
<span class="sourceLineNo">751</span>                        break;<a name="line.751"></a>
<span class="sourceLineNo">752</span>                case Dataset.FLOAT32:<a name="line.752"></a>
<span class="sourceLineNo">753</span>                        float[] f32data = ((FloatDataset) result).getData();<a name="line.753"></a>
<span class="sourceLineNo">754</span><a name="line.754"></a>
<span class="sourceLineNo">755</span>                        while (it.hasNext()) {<a name="line.755"></a>
<span class="sourceLineNo">756</span>                                f32data[it.oIndex] = (float) Math.atan2(it.aDouble, it.bDouble);<a name="line.756"></a>
<span class="sourceLineNo">757</span>                        }<a name="line.757"></a>
<span class="sourceLineNo">758</span>                        break;<a name="line.758"></a>
<span class="sourceLineNo">759</span>                case Dataset.FLOAT64:<a name="line.759"></a>
<span class="sourceLineNo">760</span>                        double[] f64data = ((DoubleDataset) result).getData();<a name="line.760"></a>
<span class="sourceLineNo">761</span><a name="line.761"></a>
<span class="sourceLineNo">762</span>                        while (it.hasNext()) {<a name="line.762"></a>
<span class="sourceLineNo">763</span>                                f64data[it.oIndex] = Math.atan2(it.aDouble, it.bDouble);<a name="line.763"></a>
<span class="sourceLineNo">764</span>                        }<a name="line.764"></a>
<span class="sourceLineNo">765</span>                        break;<a name="line.765"></a>
<span class="sourceLineNo">766</span>                case Dataset.ARRAYINT8:<a name="line.766"></a>
<span class="sourceLineNo">767</span>                        byte[] ai8data = ((CompoundByteDataset) result).getData();<a name="line.767"></a>
<span class="sourceLineNo">768</span><a name="line.768"></a>
<span class="sourceLineNo">769</span>                        if (is == 1) {<a name="line.769"></a>
<span class="sourceLineNo">770</span>                                while (it.hasNext()) {<a name="line.770"></a>
<span class="sourceLineNo">771</span>                                        ai8data[it.oIndex] = (byte) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.771"></a>
<span class="sourceLineNo">772</span>                                }<a name="line.772"></a>
<span class="sourceLineNo">773</span>                        } else if (as == 1) {<a name="line.773"></a>
<span class="sourceLineNo">774</span>                                while (it.hasNext()) {<a name="line.774"></a>
<span class="sourceLineNo">775</span>                                        ai8data[it.oIndex] = (byte) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.775"></a>
<span class="sourceLineNo">776</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.776"></a>
<span class="sourceLineNo">777</span>                                                ai8data[it.oIndex + j] = (byte) toLong(Math.atan2(it.aDouble, db.getElementDoubleAbs(it.bIndex + j)));<a name="line.777"></a>
<span class="sourceLineNo">778</span>                                        }<a name="line.778"></a>
<span class="sourceLineNo">779</span>                                }<a name="line.779"></a>
<span class="sourceLineNo">780</span>                        } else if (bs == 1) {<a name="line.780"></a>
<span class="sourceLineNo">781</span>                                while (it.hasNext()) {<a name="line.781"></a>
<span class="sourceLineNo">782</span>                                        ai8data[it.oIndex] = (byte) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.782"></a>
<span class="sourceLineNo">783</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.783"></a>
<span class="sourceLineNo">784</span>                                                ai8data[it.oIndex + j] = (byte) toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + j), it.bDouble));<a name="line.784"></a>
<span class="sourceLineNo">785</span>                                        }<a name="line.785"></a>
<span class="sourceLineNo">786</span>                                }<a name="line.786"></a>
<span class="sourceLineNo">787</span>                        } else {<a name="line.787"></a>
<span class="sourceLineNo">788</span>                                while (it.hasNext()) {<a name="line.788"></a>
<span class="sourceLineNo">789</span>                                        ai8data[it.oIndex] = (byte) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.789"></a>
<span class="sourceLineNo">790</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.790"></a>
<span class="sourceLineNo">791</span>                                                ai8data[it.oIndex + j] = (byte) toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + j), db.getElementDoubleAbs(it.bIndex + j)));<a name="line.791"></a>
<span class="sourceLineNo">792</span>                                        }<a name="line.792"></a>
<span class="sourceLineNo">793</span>                                }<a name="line.793"></a>
<span class="sourceLineNo">794</span>                        }<a name="line.794"></a>
<span class="sourceLineNo">795</span>                        break;<a name="line.795"></a>
<span class="sourceLineNo">796</span>                case Dataset.ARRAYINT16:<a name="line.796"></a>
<span class="sourceLineNo">797</span>                        short[] ai16data = ((CompoundShortDataset) result).getData();<a name="line.797"></a>
<span class="sourceLineNo">798</span><a name="line.798"></a>
<span class="sourceLineNo">799</span>                        if (is == 1) {<a name="line.799"></a>
<span class="sourceLineNo">800</span>                                while (it.hasNext()) {<a name="line.800"></a>
<span class="sourceLineNo">801</span>                                        ai16data[it.oIndex] = (short) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.801"></a>
<span class="sourceLineNo">802</span>                                }<a name="line.802"></a>
<span class="sourceLineNo">803</span>                        } else if (as == 1) {<a name="line.803"></a>
<span class="sourceLineNo">804</span>                                while (it.hasNext()) {<a name="line.804"></a>
<span class="sourceLineNo">805</span>                                        ai16data[it.oIndex] = (short) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.805"></a>
<span class="sourceLineNo">806</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.806"></a>
<span class="sourceLineNo">807</span>                                                ai16data[it.oIndex + j] = (short) toLong(Math.atan2(it.aDouble, db.getElementDoubleAbs(it.bIndex + j)));<a name="line.807"></a>
<span class="sourceLineNo">808</span>                                        }<a name="line.808"></a>
<span class="sourceLineNo">809</span>                                }<a name="line.809"></a>
<span class="sourceLineNo">810</span>                        } else if (bs == 1) {<a name="line.810"></a>
<span class="sourceLineNo">811</span>                                while (it.hasNext()) {<a name="line.811"></a>
<span class="sourceLineNo">812</span>                                        ai16data[it.oIndex] = (short) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.812"></a>
<span class="sourceLineNo">813</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.813"></a>
<span class="sourceLineNo">814</span>                                                ai16data[it.oIndex + j] = (short) toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + j), it.bDouble));<a name="line.814"></a>
<span class="sourceLineNo">815</span>                                        }<a name="line.815"></a>
<span class="sourceLineNo">816</span>                                }<a name="line.816"></a>
<span class="sourceLineNo">817</span>                        } else {<a name="line.817"></a>
<span class="sourceLineNo">818</span>                                while (it.hasNext()) {<a name="line.818"></a>
<span class="sourceLineNo">819</span>                                        ai16data[it.oIndex] = (short) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.819"></a>
<span class="sourceLineNo">820</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.820"></a>
<span class="sourceLineNo">821</span>                                                ai16data[it.oIndex + j] = (short) toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + j), db.getElementDoubleAbs(it.bIndex + j)));<a name="line.821"></a>
<span class="sourceLineNo">822</span>                                        }<a name="line.822"></a>
<span class="sourceLineNo">823</span>                                }<a name="line.823"></a>
<span class="sourceLineNo">824</span>                        }<a name="line.824"></a>
<span class="sourceLineNo">825</span>                        break;<a name="line.825"></a>
<span class="sourceLineNo">826</span>                case Dataset.ARRAYINT32:<a name="line.826"></a>
<span class="sourceLineNo">827</span>                        int[] ai32data = ((CompoundIntegerDataset) result).getData();<a name="line.827"></a>
<span class="sourceLineNo">828</span><a name="line.828"></a>
<span class="sourceLineNo">829</span>                        if (is == 1) {<a name="line.829"></a>
<span class="sourceLineNo">830</span>                                while (it.hasNext()) {<a name="line.830"></a>
<span class="sourceLineNo">831</span>                                        ai32data[it.oIndex] = (int) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.831"></a>
<span class="sourceLineNo">832</span>                                }<a name="line.832"></a>
<span class="sourceLineNo">833</span>                        } else if (as == 1) {<a name="line.833"></a>
<span class="sourceLineNo">834</span>                                while (it.hasNext()) {<a name="line.834"></a>
<span class="sourceLineNo">835</span>                                        ai32data[it.oIndex] = (int) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.835"></a>
<span class="sourceLineNo">836</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.836"></a>
<span class="sourceLineNo">837</span>                                                ai32data[it.oIndex + j] = (int) toLong(Math.atan2(it.aDouble, db.getElementDoubleAbs(it.bIndex + j)));<a name="line.837"></a>
<span class="sourceLineNo">838</span>                                        }<a name="line.838"></a>
<span class="sourceLineNo">839</span>                                }<a name="line.839"></a>
<span class="sourceLineNo">840</span>                        } else if (bs == 1) {<a name="line.840"></a>
<span class="sourceLineNo">841</span>                                while (it.hasNext()) {<a name="line.841"></a>
<span class="sourceLineNo">842</span>                                        ai32data[it.oIndex] = (int) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.842"></a>
<span class="sourceLineNo">843</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.843"></a>
<span class="sourceLineNo">844</span>                                                ai32data[it.oIndex + j] = (int) toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + j), it.bDouble));<a name="line.844"></a>
<span class="sourceLineNo">845</span>                                        }<a name="line.845"></a>
<span class="sourceLineNo">846</span>                                }<a name="line.846"></a>
<span class="sourceLineNo">847</span>                        } else {<a name="line.847"></a>
<span class="sourceLineNo">848</span>                                while (it.hasNext()) {<a name="line.848"></a>
<span class="sourceLineNo">849</span>                                        ai32data[it.oIndex] = (int) toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.849"></a>
<span class="sourceLineNo">850</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.850"></a>
<span class="sourceLineNo">851</span>                                                ai32data[it.oIndex + j] = (int) toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + j), db.getElementDoubleAbs(it.bIndex + j)));<a name="line.851"></a>
<span class="sourceLineNo">852</span>                                        }<a name="line.852"></a>
<span class="sourceLineNo">853</span>                                }<a name="line.853"></a>
<span class="sourceLineNo">854</span>                        }<a name="line.854"></a>
<span class="sourceLineNo">855</span>                        break;<a name="line.855"></a>
<span class="sourceLineNo">856</span>                case Dataset.ARRAYINT64:<a name="line.856"></a>
<span class="sourceLineNo">857</span>                        long[] ai64data = ((CompoundLongDataset) result).getData();<a name="line.857"></a>
<span class="sourceLineNo">858</span><a name="line.858"></a>
<span class="sourceLineNo">859</span>                        if (is == 1) {<a name="line.859"></a>
<span class="sourceLineNo">860</span>                                while (it.hasNext()) {<a name="line.860"></a>
<span class="sourceLineNo">861</span>                                        ai64data[it.oIndex] = toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.861"></a>
<span class="sourceLineNo">862</span>                                }<a name="line.862"></a>
<span class="sourceLineNo">863</span>                        } else if (as == 1) {<a name="line.863"></a>
<span class="sourceLineNo">864</span>                                while (it.hasNext()) {<a name="line.864"></a>
<span class="sourceLineNo">865</span>                                        ai64data[it.oIndex] = toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.865"></a>
<span class="sourceLineNo">866</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.866"></a>
<span class="sourceLineNo">867</span>                                                ai64data[it.oIndex + j] = toLong(Math.atan2(it.aDouble, db.getElementDoubleAbs(it.bIndex + j)));<a name="line.867"></a>
<span class="sourceLineNo">868</span>                                        }<a name="line.868"></a>
<span class="sourceLineNo">869</span>                                }<a name="line.869"></a>
<span class="sourceLineNo">870</span>                        } else if (bs == 1) {<a name="line.870"></a>
<span class="sourceLineNo">871</span>                                while (it.hasNext()) {<a name="line.871"></a>
<span class="sourceLineNo">872</span>                                        ai64data[it.oIndex] = toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.872"></a>
<span class="sourceLineNo">873</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.873"></a>
<span class="sourceLineNo">874</span>                                                ai64data[it.oIndex + j] = toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + j), it.bDouble));<a name="line.874"></a>
<span class="sourceLineNo">875</span>                                        }<a name="line.875"></a>
<span class="sourceLineNo">876</span>                                }<a name="line.876"></a>
<span class="sourceLineNo">877</span>                        } else {<a name="line.877"></a>
<span class="sourceLineNo">878</span>                                while (it.hasNext()) {<a name="line.878"></a>
<span class="sourceLineNo">879</span>                                        ai64data[it.oIndex] = toLong(Math.atan2(it.aDouble, it.bDouble));<a name="line.879"></a>
<span class="sourceLineNo">880</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.880"></a>
<span class="sourceLineNo">881</span>                                                ai64data[it.oIndex + j] = toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + j), db.getElementDoubleAbs(it.bIndex + j)));<a name="line.881"></a>
<span class="sourceLineNo">882</span>                                        }<a name="line.882"></a>
<span class="sourceLineNo">883</span>                                }<a name="line.883"></a>
<span class="sourceLineNo">884</span>                        }<a name="line.884"></a>
<span class="sourceLineNo">885</span>                        break;<a name="line.885"></a>
<span class="sourceLineNo">886</span>                case Dataset.ARRAYFLOAT32:<a name="line.886"></a>
<span class="sourceLineNo">887</span>                        float[] a32data = ((CompoundFloatDataset) result).getData();<a name="line.887"></a>
<span class="sourceLineNo">888</span><a name="line.888"></a>
<span class="sourceLineNo">889</span>                        if (is == 1) {<a name="line.889"></a>
<span class="sourceLineNo">890</span>                                while (it.hasNext()) {<a name="line.890"></a>
<span class="sourceLineNo">891</span>                                        a32data[it.oIndex] = (float) Math.atan2(it.aDouble, it.bDouble);<a name="line.891"></a>
<span class="sourceLineNo">892</span>                                }<a name="line.892"></a>
<span class="sourceLineNo">893</span>                        } else if (as == 1) {<a name="line.893"></a>
<span class="sourceLineNo">894</span>                                while (it.hasNext()) {<a name="line.894"></a>
<span class="sourceLineNo">895</span>                                        a32data[it.oIndex] = (float) Math.atan2(it.aDouble, it.bDouble);<a name="line.895"></a>
<span class="sourceLineNo">896</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.896"></a>
<span class="sourceLineNo">897</span>                                                a32data[it.oIndex + j] = (float) Math.atan2(it.aDouble, db.getElementDoubleAbs(it.bIndex + j));<a name="line.897"></a>
<span class="sourceLineNo">898</span>                                        }<a name="line.898"></a>
<span class="sourceLineNo">899</span>                                }<a name="line.899"></a>
<span class="sourceLineNo">900</span>                        } else if (bs == 1) {<a name="line.900"></a>
<span class="sourceLineNo">901</span>                                while (it.hasNext()) {<a name="line.901"></a>
<span class="sourceLineNo">902</span>                                        a32data[it.oIndex] = (float) Math.atan2(it.aDouble, it.bDouble);<a name="line.902"></a>
<span class="sourceLineNo">903</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.903"></a>
<span class="sourceLineNo">904</span>                                                a32data[it.oIndex + j] = (float) Math.atan2(da.getElementDoubleAbs(it.aIndex + j), it.bDouble);<a name="line.904"></a>
<span class="sourceLineNo">905</span>                                        }<a name="line.905"></a>
<span class="sourceLineNo">906</span>                                }<a name="line.906"></a>
<span class="sourceLineNo">907</span>                        } else {<a name="line.907"></a>
<span class="sourceLineNo">908</span>                                while (it.hasNext()) {<a name="line.908"></a>
<span class="sourceLineNo">909</span>                                        a32data[it.oIndex] = (float) Math.atan2(it.aDouble, it.bDouble);<a name="line.909"></a>
<span class="sourceLineNo">910</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.910"></a>
<span class="sourceLineNo">911</span>                                                a32data[it.oIndex + j] = (float) Math.atan2(da.getElementDoubleAbs(it.aIndex + j), db.getElementDoubleAbs(it.bIndex + j));<a name="line.911"></a>
<span class="sourceLineNo">912</span>                                        }<a name="line.912"></a>
<span class="sourceLineNo">913</span>                                }<a name="line.913"></a>
<span class="sourceLineNo">914</span>                        }<a name="line.914"></a>
<span class="sourceLineNo">915</span>                        break;<a name="line.915"></a>
<span class="sourceLineNo">916</span>                case Dataset.ARRAYFLOAT64:<a name="line.916"></a>
<span class="sourceLineNo">917</span>                        double[] a64data = ((CompoundDoubleDataset) result).getData();<a name="line.917"></a>
<span class="sourceLineNo">918</span><a name="line.918"></a>
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<span class="sourceLineNo">921</span>                                        a64data[it.oIndex] = Math.atan2(it.aDouble, it.bDouble);<a name="line.921"></a>
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<span class="sourceLineNo">925</span>                                        a64data[it.oIndex] = Math.atan2(it.aDouble, it.bDouble);<a name="line.925"></a>
<span class="sourceLineNo">926</span>                                        for (int j = 1; j &lt; is; j++) {<a name="line.926"></a>
<span class="sourceLineNo">927</span>                                                a64data[it.oIndex + j] = Math.atan2(it.aDouble, db.getElementDoubleAbs(it.bIndex + j));<a name="line.927"></a>
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<span class="sourceLineNo">934</span>                                                a64data[it.oIndex + j] = Math.atan2(da.getElementDoubleAbs(it.aIndex + j), it.bDouble);<a name="line.934"></a>
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<span class="sourceLineNo">939</span>                                        a64data[it.oIndex] = Math.atan2(it.aDouble, it.bDouble);<a name="line.939"></a>
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<span class="sourceLineNo">941</span>                                                a64data[it.oIndex + j] = Math.atan2(da.getElementDoubleAbs(it.aIndex + j), db.getElementDoubleAbs(it.bIndex + j));<a name="line.941"></a>
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<span class="sourceLineNo">955</span>        /**<a name="line.955"></a>
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<span class="sourceLineNo">957</span>         * @param a<a name="line.957"></a>
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<span class="sourceLineNo">964</span>        /**<a name="line.964"></a>
<span class="sourceLineNo">965</span>         * Create a dataset of the arguments from a complex dataset<a name="line.965"></a>
<span class="sourceLineNo">966</span>         * @param a<a name="line.966"></a>
<span class="sourceLineNo">967</span>         * @param inDegrees if true then return angles in degrees else in radians<a name="line.967"></a>
<span class="sourceLineNo">968</span>         * @return dataset of angles<a name="line.968"></a>
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<span class="sourceLineNo">970</span>        public static Dataset angle(final Object a, final boolean inDegrees) {<a name="line.970"></a>
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<span class="sourceLineNo">974</span>        /**<a name="line.974"></a>
<span class="sourceLineNo">975</span>         * Create a dataset of the arguments from a complex dataset<a name="line.975"></a>
<span class="sourceLineNo">976</span>         * @param a<a name="line.976"></a>
<span class="sourceLineNo">977</span>         * @param o output can be null - in which case, a new dataset is created<a name="line.977"></a>
<span class="sourceLineNo">978</span>         * @return dataset of angles in radians<a name="line.978"></a>
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<span class="sourceLineNo">980</span>        public static Dataset angle(final Object a, final Dataset o) {<a name="line.980"></a>
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<span class="sourceLineNo">984</span>        /**<a name="line.984"></a>
<span class="sourceLineNo">985</span>         * Create a dataset of the arguments from a complex dataset<a name="line.985"></a>
<span class="sourceLineNo">986</span>         * @param a<a name="line.986"></a>
<span class="sourceLineNo">987</span>         * @param inDegrees if true then return angles in degrees else in radians<a name="line.987"></a>
<span class="sourceLineNo">988</span>         * @param o output can be null - in which case, a new dataset is created<a name="line.988"></a>
<span class="sourceLineNo">989</span>         * @return dataset of angles<a name="line.989"></a>
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<span class="sourceLineNo">991</span>        public static Dataset angle(final Object a, final boolean inDegrees, final Dataset o) {<a name="line.991"></a>
<span class="sourceLineNo">992</span>                final Dataset da = a instanceof Dataset ? (Dataset) a : DatasetFactory.createFromObject(a);<a name="line.992"></a>
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<span class="sourceLineNo">1001</span>                final int dt = result.getDType();<a name="line.1001"></a>
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<span class="sourceLineNo">1003</span>                switch(dt) {<a name="line.1003"></a>
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<span class="sourceLineNo">1008</span>                        if (inDegrees) {<a name="line.1008"></a>
<span class="sourceLineNo">1009</span>                                while (it.hasNext()) {<a name="line.1009"></a>
<span class="sourceLineNo">1010</span>                                        oi8data[it.oIndex] = (byte) toLong(Math.toDegrees(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble)));<a name="line.1010"></a>
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<span class="sourceLineNo">1013</span>                                while (it.hasNext()) {<a name="line.1013"></a>
<span class="sourceLineNo">1014</span>                                        oi8data[it.oIndex] = (byte) toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble));<a name="line.1014"></a>
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<span class="sourceLineNo">1022</span>                        if (inDegrees) {<a name="line.1022"></a>
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<span class="sourceLineNo">1024</span>                                        oi16data[it.oIndex] = (short) toLong(Math.toDegrees(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble)));<a name="line.1024"></a>
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<span class="sourceLineNo">1027</span>                                while (it.hasNext()) {<a name="line.1027"></a>
<span class="sourceLineNo">1028</span>                                        oi16data[it.oIndex] = (short) toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble));<a name="line.1028"></a>
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<span class="sourceLineNo">1030</span>                        }<a name="line.1030"></a>
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<span class="sourceLineNo">1032</span>                case Dataset.INT32:<a name="line.1032"></a>
<span class="sourceLineNo">1033</span>                        final int[] oi32data = ((IntegerDataset) result).data;<a name="line.1033"></a>
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<span class="sourceLineNo">1035</span><a name="line.1035"></a>
<span class="sourceLineNo">1036</span>                        if (inDegrees) {<a name="line.1036"></a>
<span class="sourceLineNo">1037</span>                                while (it.hasNext()) {<a name="line.1037"></a>
<span class="sourceLineNo">1038</span>                                        oi32data[it.oIndex] = (int) toLong(Math.toDegrees(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble)));<a name="line.1038"></a>
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<span class="sourceLineNo">1040</span>                        } else {<a name="line.1040"></a>
<span class="sourceLineNo">1041</span>                                while (it.hasNext()) {<a name="line.1041"></a>
<span class="sourceLineNo">1042</span>                                        oi32data[it.oIndex] = (int) toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble));<a name="line.1042"></a>
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<span class="sourceLineNo">1044</span>                        }<a name="line.1044"></a>
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<span class="sourceLineNo">1049</span><a name="line.1049"></a>
<span class="sourceLineNo">1050</span>                        if (inDegrees) {<a name="line.1050"></a>
<span class="sourceLineNo">1051</span>                                while (it.hasNext()) {<a name="line.1051"></a>
<span class="sourceLineNo">1052</span>                                        oi64data[it.oIndex] = toLong(Math.toDegrees(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble)));<a name="line.1052"></a>
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<span class="sourceLineNo">1054</span>                        } else {<a name="line.1054"></a>
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<span class="sourceLineNo">1056</span>                                        oi64data[it.oIndex] = toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble));<a name="line.1056"></a>
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<span class="sourceLineNo">1058</span>                        }<a name="line.1058"></a>
<span class="sourceLineNo">1059</span>                        break;<a name="line.1059"></a>
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<span class="sourceLineNo">1061</span>                        final byte[] oai8data = ((CompoundByteDataset) result).data;<a name="line.1061"></a>
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<span class="sourceLineNo">1063</span><a name="line.1063"></a>
<span class="sourceLineNo">1064</span>                        if (inDegrees) {<a name="line.1064"></a>
<span class="sourceLineNo">1065</span>                                while (it.hasNext()) {<a name="line.1065"></a>
<span class="sourceLineNo">1066</span>                                        final byte ox = (byte) toLong(Math.toDegrees(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble)));<a name="line.1066"></a>
<span class="sourceLineNo">1067</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.1067"></a>
<span class="sourceLineNo">1068</span>                                                oai8data[it.oIndex + j] = ox;<a name="line.1068"></a>
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<span class="sourceLineNo">1071</span>                        } else {<a name="line.1071"></a>
<span class="sourceLineNo">1072</span>                                while (it.hasNext()) {<a name="line.1072"></a>
<span class="sourceLineNo">1073</span>                                        final byte ox = (byte) toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble));<a name="line.1073"></a>
<span class="sourceLineNo">1074</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.1074"></a>
<span class="sourceLineNo">1075</span>                                                oai8data[it.oIndex + j] = ox;<a name="line.1075"></a>
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<span class="sourceLineNo">1077</span>                                }<a name="line.1077"></a>
<span class="sourceLineNo">1078</span>                        }<a name="line.1078"></a>
<span class="sourceLineNo">1079</span>                        break;<a name="line.1079"></a>
<span class="sourceLineNo">1080</span>                case Dataset.ARRAYINT16:<a name="line.1080"></a>
<span class="sourceLineNo">1081</span>                        final short[] oai16data = ((CompoundShortDataset) result).data;<a name="line.1081"></a>
<span class="sourceLineNo">1082</span>                        it.setOutputDouble(false);<a name="line.1082"></a>
<span class="sourceLineNo">1083</span><a name="line.1083"></a>
<span class="sourceLineNo">1084</span>                        if (inDegrees) {<a name="line.1084"></a>
<span class="sourceLineNo">1085</span>                                while (it.hasNext()) {<a name="line.1085"></a>
<span class="sourceLineNo">1086</span>                                        final short ox = (short) toLong(Math.toDegrees(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble)));<a name="line.1086"></a>
<span class="sourceLineNo">1087</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.1087"></a>
<span class="sourceLineNo">1088</span>                                                oai16data[it.oIndex + j] = ox;<a name="line.1088"></a>
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<span class="sourceLineNo">1090</span>                                }<a name="line.1090"></a>
<span class="sourceLineNo">1091</span>                        } else {<a name="line.1091"></a>
<span class="sourceLineNo">1092</span>                                while (it.hasNext()) {<a name="line.1092"></a>
<span class="sourceLineNo">1093</span>                                        final short ox = (short) toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble));<a name="line.1093"></a>
<span class="sourceLineNo">1094</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.1094"></a>
<span class="sourceLineNo">1095</span>                                                oai16data[it.oIndex + j] = ox;<a name="line.1095"></a>
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<span class="sourceLineNo">1097</span>                                }<a name="line.1097"></a>
<span class="sourceLineNo">1098</span>                        }<a name="line.1098"></a>
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<span class="sourceLineNo">1100</span>                case Dataset.ARRAYINT32:<a name="line.1100"></a>
<span class="sourceLineNo">1101</span>                        final int[] oai32data = ((CompoundIntegerDataset) result).data;<a name="line.1101"></a>
<span class="sourceLineNo">1102</span>                        it.setOutputDouble(false);<a name="line.1102"></a>
<span class="sourceLineNo">1103</span><a name="line.1103"></a>
<span class="sourceLineNo">1104</span>                        if (inDegrees) {<a name="line.1104"></a>
<span class="sourceLineNo">1105</span>                                while (it.hasNext()) {<a name="line.1105"></a>
<span class="sourceLineNo">1106</span>                                        final int ox = (int) toLong(Math.toDegrees(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble)));<a name="line.1106"></a>
<span class="sourceLineNo">1107</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.1107"></a>
<span class="sourceLineNo">1108</span>                                                oai32data[it.oIndex + j] = ox;<a name="line.1108"></a>
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<span class="sourceLineNo">1110</span>                                }<a name="line.1110"></a>
<span class="sourceLineNo">1111</span>                        } else {<a name="line.1111"></a>
<span class="sourceLineNo">1112</span>                                while (it.hasNext()) {<a name="line.1112"></a>
<span class="sourceLineNo">1113</span>                                        final int ox = (int) toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble));<a name="line.1113"></a>
<span class="sourceLineNo">1114</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.1114"></a>
<span class="sourceLineNo">1115</span>                                                oai32data[it.oIndex + j] = ox;<a name="line.1115"></a>
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<span class="sourceLineNo">1121</span>                        final long[] oai64data = ((CompoundLongDataset) result).data;<a name="line.1121"></a>
<span class="sourceLineNo">1122</span>                        it.setOutputDouble(false);<a name="line.1122"></a>
<span class="sourceLineNo">1123</span><a name="line.1123"></a>
<span class="sourceLineNo">1124</span>                        if (inDegrees) {<a name="line.1124"></a>
<span class="sourceLineNo">1125</span>                                while (it.hasNext()) {<a name="line.1125"></a>
<span class="sourceLineNo">1126</span>                                        final long ox = toLong(Math.toDegrees(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble)));<a name="line.1126"></a>
<span class="sourceLineNo">1127</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.1127"></a>
<span class="sourceLineNo">1128</span>                                                oai64data[it.oIndex + j] = ox;<a name="line.1128"></a>
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<span class="sourceLineNo">1132</span>                                while (it.hasNext()) {<a name="line.1132"></a>
<span class="sourceLineNo">1133</span>                                        final long ox = toLong(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble));<a name="line.1133"></a>
<span class="sourceLineNo">1134</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.1134"></a>
<span class="sourceLineNo">1135</span>                                                oai64data[it.oIndex + j] = ox;<a name="line.1135"></a>
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<span class="sourceLineNo">1137</span>                                }<a name="line.1137"></a>
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<span class="sourceLineNo">1158</span>                                        of64data[it.oIndex] = Math.toDegrees(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble));<a name="line.1158"></a>
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<span class="sourceLineNo">1190</span>                                        final double ox = Math.toDegrees(Math.atan2(da.getElementDoubleAbs(it.aIndex + 1), it.aDouble));<a name="line.1190"></a>
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<span class="sourceLineNo">1198</span>                                        for (int j = 0; j &lt; is; j++) {<a name="line.1198"></a>
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<span class="sourceLineNo">1243</span>        /**<a name="line.1243"></a>
<span class="sourceLineNo">1244</span>         * Create a phase only dataset. NB it will contain NaNs if there are any items with zero amplitude<a name="line.1244"></a>
<span class="sourceLineNo">1245</span>         * @param a dataset<a name="line.1245"></a>
<span class="sourceLineNo">1246</span>         * @param keepZeros if true then zero items are returned as zero rather than NaNs<a name="line.1246"></a>
<span class="sourceLineNo">1247</span>         * @return complex dataset where items have unit amplitude<a name="line.1247"></a>
<span class="sourceLineNo">1248</span>         */<a name="line.1248"></a>
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<span class="sourceLineNo">1253</span>        /**<a name="line.1253"></a>
<span class="sourceLineNo">1254</span>         * Create a phase only dataset. NB it will contain NaNs if there are any items with zero amplitude<a name="line.1254"></a>
<span class="sourceLineNo">1255</span>         * @param a dataset<a name="line.1255"></a>
<span class="sourceLineNo">1256</span>         * @param o output can be null - in which case, a new dataset is created<a name="line.1256"></a>
<span class="sourceLineNo">1257</span>         * @param keepZeros if true then zero items are returned as zero rather than NaNs<a name="line.1257"></a>
<span class="sourceLineNo">1258</span>         * @return complex dataset where items have unit amplitude<a name="line.1258"></a>
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<span class="sourceLineNo">1261</span>                final Dataset da = a instanceof Dataset ? (Dataset) a : DatasetFactory.createFromObject(a);<a name="line.1261"></a>
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<span class="sourceLineNo">1280</span>                                        double ri = da.getElementDoubleAbs(it.aIndex + 1);<a name="line.1280"></a>
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<span class="sourceLineNo">1287</span>                                                z64data[it.oIndex + 1] = (float) (ri/am);<a name="line.1287"></a>
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<span class="sourceLineNo">1293</span>                                        double ri = da.getElementDoubleAbs(it.aIndex + 1);<a name="line.1293"></a>
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<span class="sourceLineNo">1307</span>                                        double am = Math.hypot(rr, ri);<a name="line.1307"></a>
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<span class="sourceLineNo">1310</span>                                                z128data[it.oIndex + 1] = 0;<a name="line.1310"></a>
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<span class="sourceLineNo">1313</span>                                                z128data[it.oIndex + 1] = ri / am;<a name="line.1313"></a>
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<span class="sourceLineNo">1334</span>         * Adds all sets passed in together<a name="line.1334"></a>
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<span class="sourceLineNo">1336</span>         * The first IDataset must cast to Dataset<a name="line.1336"></a>
<span class="sourceLineNo">1337</span>         * <a name="line.1337"></a>
<span class="sourceLineNo">1338</span>         * For memory efficiency sake if add(...) is called with a<a name="line.1338"></a>
<span class="sourceLineNo">1339</span>         * set of size one, no clone is done, the original object is<a name="line.1339"></a>
<span class="sourceLineNo">1340</span>         * returned directly. Otherwise a new data set is returned,<a name="line.1340"></a>
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<span class="sourceLineNo">1345</span>         * @return sum of collection<a name="line.1345"></a>
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<span class="sourceLineNo">1348</span>                if (sets.isEmpty())<a name="line.1348"></a>
<span class="sourceLineNo">1349</span>                        return null;<a name="line.1349"></a>
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<span class="sourceLineNo">1364</span>         * Multiplies all sets passed in together<a name="line.1364"></a>
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<span class="sourceLineNo">1366</span>         * The first IDataset must cast to Dataset<a name="line.1366"></a>
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<span class="sourceLineNo">1369</span>         * @param requireClone<a name="line.1369"></a>
<span class="sourceLineNo">1370</span>         * @return product of collection<a name="line.1370"></a>
<span class="sourceLineNo">1371</span>         */<a name="line.1371"></a>
<span class="sourceLineNo">1372</span>        public static Dataset multiply(final Collection&lt;IDataset&gt; sets, boolean requireClone) {<a name="line.1372"></a>
<span class="sourceLineNo">1373</span>                if (sets.isEmpty())<a name="line.1373"></a>
<span class="sourceLineNo">1374</span>                        return null;<a name="line.1374"></a>
<span class="sourceLineNo">1375</span>                final Iterator&lt;IDataset&gt; it = sets.iterator();<a name="line.1375"></a>
<span class="sourceLineNo">1376</span>                if (sets.size() == 1)<a name="line.1376"></a>
<span class="sourceLineNo">1377</span>                        return DatasetUtils.convertToDataset(it.next());<a name="line.1377"></a>
<span class="sourceLineNo">1378</span>                Dataset product = requireClone ? ((Dataset) it.next()).clone() : (Dataset) it.next();<a name="line.1378"></a>
<span class="sourceLineNo">1379</span>        <a name="line.1379"></a>
<span class="sourceLineNo">1380</span>                while (it.hasNext()) {<a name="line.1380"></a>
<span class="sourceLineNo">1381</span>                        multiply(product, it.next(), product);<a name="line.1381"></a>
<span class="sourceLineNo">1382</span>                }<a name="line.1382"></a>
<span class="sourceLineNo">1383</span>        <a name="line.1383"></a>
<span class="sourceLineNo">1384</span>                return product;<a name="line.1384"></a>
<span class="sourceLineNo">1385</span>        }<a name="line.1385"></a>
<span class="sourceLineNo">1386</span><a name="line.1386"></a>
<span class="sourceLineNo">1387</span>        /**<a name="line.1387"></a>
<span class="sourceLineNo">1388</span>         * Linearly interpolate values at points in a 1D dataset corresponding to given coordinates.<a name="line.1388"></a>
<span class="sourceLineNo">1389</span>         * @param x input 1-D coordinate dataset (must be ordered)<a name="line.1389"></a>
<span class="sourceLineNo">1390</span>         * @param d input 1-D dataset<a name="line.1390"></a>
<span class="sourceLineNo">1391</span>         * @param x0 coordinate values<a name="line.1391"></a>
<span class="sourceLineNo">1392</span>         * @param left value to use when x0 lies left of domain. If null, then interpolate to zero by using leftmost interval<a name="line.1392"></a>
<span class="sourceLineNo">1393</span>         * @param right value to use when x0 lies right of domain. If null, then interpolate to zero by using rightmost interval<a name="line.1393"></a>
<span class="sourceLineNo">1394</span>         * @return interpolated values<a name="line.1394"></a>
<span class="sourceLineNo">1395</span>         */<a name="line.1395"></a>
<span class="sourceLineNo">1396</span>        public static Dataset interpolate(final Dataset x, final Dataset d, final IDataset x0, Number left, Number right) {<a name="line.1396"></a>
<span class="sourceLineNo">1397</span>                assert x.getRank() == 1;<a name="line.1397"></a>
<span class="sourceLineNo">1398</span>                assert d.getRank() == 1;<a name="line.1398"></a>
<span class="sourceLineNo">1399</span>        <a name="line.1399"></a>
<span class="sourceLineNo">1400</span>                DoubleDataset r = DatasetFactory.zeros(DoubleDataset.class, x0.getShape());<a name="line.1400"></a>
<span class="sourceLineNo">1401</span><a name="line.1401"></a>
<span class="sourceLineNo">1402</span>                Monotonicity mono = Comparisons.findMonotonicity(x);<a name="line.1402"></a>
<span class="sourceLineNo">1403</span>                if (mono == Monotonicity.NOT_ORDERED) {<a name="line.1403"></a>
<span class="sourceLineNo">1404</span>                        throw new IllegalArgumentException("Dataset x must be ordered");<a name="line.1404"></a>
<span class="sourceLineNo">1405</span>                }<a name="line.1405"></a>
<span class="sourceLineNo">1406</span>                DoubleDataset dx = (DoubleDataset) DatasetUtils.cast(x, Dataset.FLOAT64);<a name="line.1406"></a>
<span class="sourceLineNo">1407</span>                Dataset dx0 = DatasetUtils.convertToDataset(x0);<a name="line.1407"></a>
<span class="sourceLineNo">1408</span>                if (x == dx) {<a name="line.1408"></a>
<span class="sourceLineNo">1409</span>                        dx = (DoubleDataset) x.flatten();<a name="line.1409"></a>
<span class="sourceLineNo">1410</span>                }<a name="line.1410"></a>
<span class="sourceLineNo">1411</span>                double[] xa = dx.getData();<a name="line.1411"></a>
<span class="sourceLineNo">1412</span>                int s = xa.length - 1;<a name="line.1412"></a>
<span class="sourceLineNo">1413</span>                boolean isReversed = mono == Monotonicity.STRICTLY_DECREASING || mono == Monotonicity.NONINCREASING;<a name="line.1413"></a>
<span class="sourceLineNo">1414</span>                if (isReversed) {<a name="line.1414"></a>
<span class="sourceLineNo">1415</span>                        double[] txa = xa.clone();<a name="line.1415"></a>
<span class="sourceLineNo">1416</span>                        for (int i = 0; i &lt;= s; i++) { // reverse order<a name="line.1416"></a>
<span class="sourceLineNo">1417</span>                                txa[s - i] = xa[i];<a name="line.1417"></a>
<span class="sourceLineNo">1418</span>                        }<a name="line.1418"></a>
<span class="sourceLineNo">1419</span>                        xa = txa;<a name="line.1419"></a>
<span class="sourceLineNo">1420</span>                }<a name="line.1420"></a>
<span class="sourceLineNo">1421</span><a name="line.1421"></a>
<span class="sourceLineNo">1422</span>                IndexIterator it = dx0.getIterator();<a name="line.1422"></a>
<span class="sourceLineNo">1423</span>                int k = -1;<a name="line.1423"></a>
<span class="sourceLineNo">1424</span>                while (it.hasNext()) {<a name="line.1424"></a>
<span class="sourceLineNo">1425</span>                        k++;<a name="line.1425"></a>
<span class="sourceLineNo">1426</span>                        double v = dx0.getElementDoubleAbs(it.index);<a name="line.1426"></a>
<span class="sourceLineNo">1427</span>                        int i = Arrays.binarySearch(xa, v);<a name="line.1427"></a>
<span class="sourceLineNo">1428</span>                        if (i &lt; 0) {<a name="line.1428"></a>
<span class="sourceLineNo">1429</span>                                // i = -(insertion point) - 1<a name="line.1429"></a>
<span class="sourceLineNo">1430</span>                                if (i == -1) {<a name="line.1430"></a>
<span class="sourceLineNo">1431</span>                                        if (left != null) {<a name="line.1431"></a>
<span class="sourceLineNo">1432</span>                                                r.setAbs(k, left.doubleValue());<a name="line.1432"></a>
<span class="sourceLineNo">1433</span>                                                continue;<a name="line.1433"></a>
<span class="sourceLineNo">1434</span>                                        }<a name="line.1434"></a>
<span class="sourceLineNo">1435</span>                                        final double d1 = xa[0] - xa[1];<a name="line.1435"></a>
<span class="sourceLineNo">1436</span>                                        double t = d1 - v + xa[0];<a name="line.1436"></a>
<span class="sourceLineNo">1437</span>                                        if (t &gt;= 0)<a name="line.1437"></a>
<span class="sourceLineNo">1438</span>                                                continue; // sets to zero<a name="line.1438"></a>
<span class="sourceLineNo">1439</span>                                        t /= d1;<a name="line.1439"></a>
<span class="sourceLineNo">1440</span>                                        r.setAbs(k, t * d.getDouble(isReversed ? s : 0));<a name="line.1440"></a>
<span class="sourceLineNo">1441</span>                                } else if (i == -s - 2) {<a name="line.1441"></a>
<span class="sourceLineNo">1442</span>                                        if (right != null) {<a name="line.1442"></a>
<span class="sourceLineNo">1443</span>                                                r.setAbs(k, right.doubleValue());<a name="line.1443"></a>
<span class="sourceLineNo">1444</span>                                                continue;<a name="line.1444"></a>
<span class="sourceLineNo">1445</span>                                        }<a name="line.1445"></a>
<span class="sourceLineNo">1446</span>                                        final double d1 = xa[s] - xa[s - 1];<a name="line.1446"></a>
<span class="sourceLineNo">1447</span>                                        double t = d1 - v + xa[s];<a name="line.1447"></a>
<span class="sourceLineNo">1448</span>                                        if (t &lt;= 0)<a name="line.1448"></a>
<span class="sourceLineNo">1449</span>                                                continue; // sets to zero<a name="line.1449"></a>
<span class="sourceLineNo">1450</span>                                        t /= d1;<a name="line.1450"></a>
<span class="sourceLineNo">1451</span>                                        r.setAbs(k, t * d.getDouble(isReversed ? 0 : s));<a name="line.1451"></a>
<span class="sourceLineNo">1452</span>                                } else {<a name="line.1452"></a>
<span class="sourceLineNo">1453</span>                                        i = -i - 1;<a name="line.1453"></a>
<span class="sourceLineNo">1454</span>                                        double t = (xa[i] - v)/(xa[i] - xa[i - 1]);<a name="line.1454"></a>
<span class="sourceLineNo">1455</span>                                        if (isReversed) {<a name="line.1455"></a>
<span class="sourceLineNo">1456</span>                                                i = s - i;<a name="line.1456"></a>
<span class="sourceLineNo">1457</span>                                                r.setAbs(k, t * d.getDouble(i + 1) + (1 - t) * d.getDouble(i));<a name="line.1457"></a>
<span class="sourceLineNo">1458</span>                                        } else {<a name="line.1458"></a>
<span class="sourceLineNo">1459</span>                                                r.setAbs(k, (1 - t) * d.getDouble(i) + t * d.getDouble(i - 1));<a name="line.1459"></a>
<span class="sourceLineNo">1460</span>                                        }<a name="line.1460"></a>
<span class="sourceLineNo">1461</span>                                }<a name="line.1461"></a>
<span class="sourceLineNo">1462</span>                        } else {<a name="line.1462"></a>
<span class="sourceLineNo">1463</span>                                r.setAbs(k, d.getDouble(isReversed ? s - i : i));<a name="line.1463"></a>
<span class="sourceLineNo">1464</span>                        }<a name="line.1464"></a>
<span class="sourceLineNo">1465</span>                }<a name="line.1465"></a>
<span class="sourceLineNo">1466</span>                return r;<a name="line.1466"></a>
<span class="sourceLineNo">1467</span>        }<a name="line.1467"></a>
<span class="sourceLineNo">1468</span><a name="line.1468"></a>
<span class="sourceLineNo">1469</span>        /**<a name="line.1469"></a>
<span class="sourceLineNo">1470</span>         * Linearly interpolate a value at a point in a 1D dataset. The dataset is considered to have<a name="line.1470"></a>
<span class="sourceLineNo">1471</span>         * zero support outside its bounds. Thus points just outside are interpolated from the boundary<a name="line.1471"></a>
<span class="sourceLineNo">1472</span>         * value to zero.<a name="line.1472"></a>
<span class="sourceLineNo">1473</span>         * @param d input dataset<a name="line.1473"></a>
<span class="sourceLineNo">1474</span>         * @param x0 coordinate<a name="line.1474"></a>
<span class="sourceLineNo">1475</span>         * @return interpolated value<a name="line.1475"></a>
<span class="sourceLineNo">1476</span>         */<a name="line.1476"></a>
<span class="sourceLineNo">1477</span>        public static double interpolate(final Dataset d, final double x0) {<a name="line.1477"></a>
<span class="sourceLineNo">1478</span>                assert d.getRank() == 1;<a name="line.1478"></a>
<span class="sourceLineNo">1479</span><a name="line.1479"></a>
<span class="sourceLineNo">1480</span>                final int i0 = (int) Math.floor(x0);<a name="line.1480"></a>
<span class="sourceLineNo">1481</span>                final int e0 = d.getSize() - 1;<a name="line.1481"></a>
<span class="sourceLineNo">1482</span>                if (i0 &lt; -1 || i0 &gt; e0)<a name="line.1482"></a>
<span class="sourceLineNo">1483</span>                        return 0;<a name="line.1483"></a>
<span class="sourceLineNo">1484</span><a name="line.1484"></a>
<span class="sourceLineNo">1485</span>                final double u0 = x0 - i0;<a name="line.1485"></a>
<span class="sourceLineNo">1486</span><a name="line.1486"></a>
<span class="sourceLineNo">1487</span>                double r = 0;<a name="line.1487"></a>
<span class="sourceLineNo">1488</span>                final double f1 = i0 &lt; 0 ? 0 : d.getDouble(i0);<a name="line.1488"></a>
<span class="sourceLineNo">1489</span>                if (u0 &gt; 0) {<a name="line.1489"></a>
<span class="sourceLineNo">1490</span>                        r = (1 - u0) * f1 + (i0 == e0 ? 0 : u0 * d.getDouble(i0 + 1));<a name="line.1490"></a>
<span class="sourceLineNo">1491</span>                } else {<a name="line.1491"></a>
<span class="sourceLineNo">1492</span>                        r = f1;<a name="line.1492"></a>
<span class="sourceLineNo">1493</span>                }<a name="line.1493"></a>
<span class="sourceLineNo">1494</span>                return r;<a name="line.1494"></a>
<span class="sourceLineNo">1495</span>        }<a name="line.1495"></a>
<span class="sourceLineNo">1496</span><a name="line.1496"></a>
<span class="sourceLineNo">1497</span>        /**<a name="line.1497"></a>
<span class="sourceLineNo">1498</span>         * Linearly interpolate a value at a point in a 1D dataset with a mask. The dataset is considered<a name="line.1498"></a>
<span class="sourceLineNo">1499</span>         * to have zero support outside its bounds. Thus points just outside are interpolated from the<a name="line.1499"></a>
<span class="sourceLineNo">1500</span>         * boundary value to zero.<a name="line.1500"></a>
<span class="sourceLineNo">1501</span>         * @param d input dataset<a name="line.1501"></a>
<span class="sourceLineNo">1502</span>         * @param m mask dataset<a name="line.1502"></a>
<span class="sourceLineNo">1503</span>         * @param x0 coordinate<a name="line.1503"></a>
<span class="sourceLineNo">1504</span>         * @return interpolated value<a name="line.1504"></a>
<span class="sourceLineNo">1505</span>         */<a name="line.1505"></a>
<span class="sourceLineNo">1506</span>        public static double interpolate(final Dataset d, final Dataset m, final double x0) {<a name="line.1506"></a>
<span class="sourceLineNo">1507</span>                assert d.getRank() == 1;<a name="line.1507"></a>
<span class="sourceLineNo">1508</span>                assert m.getRank() == 1;<a name="line.1508"></a>
<span class="sourceLineNo">1509</span><a name="line.1509"></a>
<span class="sourceLineNo">1510</span>                final int i0 = (int) Math.floor(x0);<a name="line.1510"></a>
<span class="sourceLineNo">1511</span>                final int e0 = d.getSize() - 1;<a name="line.1511"></a>
<span class="sourceLineNo">1512</span>                if (i0 &lt; -1 || i0 &gt; e0)<a name="line.1512"></a>
<span class="sourceLineNo">1513</span>                        return 0;<a name="line.1513"></a>
<span class="sourceLineNo">1514</span><a name="line.1514"></a>
<span class="sourceLineNo">1515</span>                final double u0 = x0 - i0;<a name="line.1515"></a>
<span class="sourceLineNo">1516</span><a name="line.1516"></a>
<span class="sourceLineNo">1517</span>                double r = 0;<a name="line.1517"></a>
<span class="sourceLineNo">1518</span>                final double f1 = i0 &lt; 0 ? 0 : d.getDouble(i0) * m.getDouble(i0);<a name="line.1518"></a>
<span class="sourceLineNo">1519</span>                if (u0 &gt; 0) {<a name="line.1519"></a>
<span class="sourceLineNo">1520</span>                        r = (1 - u0) * f1 + (i0 == e0 ? 0 : u0 * d.getDouble(i0 + 1) * m.getDouble(i0 + 1));<a name="line.1520"></a>
<span class="sourceLineNo">1521</span>                } else {<a name="line.1521"></a>
<span class="sourceLineNo">1522</span>                        r = f1;<a name="line.1522"></a>
<span class="sourceLineNo">1523</span>                }<a name="line.1523"></a>
<span class="sourceLineNo">1524</span>                return r;<a name="line.1524"></a>
<span class="sourceLineNo">1525</span>        }<a name="line.1525"></a>
<span class="sourceLineNo">1526</span><a name="line.1526"></a>
<span class="sourceLineNo">1527</span>        /**<a name="line.1527"></a>
<span class="sourceLineNo">1528</span>         * Linearly interpolate an array of values at a point in a compound 1D dataset. The dataset is<a name="line.1528"></a>
<span class="sourceLineNo">1529</span>         * considered to have zero support outside its bounds. Thus points just outside are interpolated<a name="line.1529"></a>
<span class="sourceLineNo">1530</span>         * from the boundary value to zero.<a name="line.1530"></a>
<span class="sourceLineNo">1531</span>         * @param values interpolated array<a name="line.1531"></a>
<span class="sourceLineNo">1532</span>         * @param d input dataset<a name="line.1532"></a>
<span class="sourceLineNo">1533</span>         * @param x0 coordinate<a name="line.1533"></a>
<span class="sourceLineNo">1534</span>         */<a name="line.1534"></a>
<span class="sourceLineNo">1535</span>        public static void interpolate(final double[] values, final CompoundDataset d, final double x0) {<a name="line.1535"></a>
<span class="sourceLineNo">1536</span>                assert d.getRank() == 1;<a name="line.1536"></a>
<span class="sourceLineNo">1537</span><a name="line.1537"></a>
<span class="sourceLineNo">1538</span>                final int is = d.getElementsPerItem();<a name="line.1538"></a>
<span class="sourceLineNo">1539</span>                if (is != values.length)<a name="line.1539"></a>
<span class="sourceLineNo">1540</span>                        throw new IllegalArgumentException("Output array length must match elements in item");<a name="line.1540"></a>
<span class="sourceLineNo">1541</span>                final double[] f1, f2;<a name="line.1541"></a>
<span class="sourceLineNo">1542</span>        <a name="line.1542"></a>
<span class="sourceLineNo">1543</span>                final int i0 = (int) Math.floor(x0);<a name="line.1543"></a>
<span class="sourceLineNo">1544</span>                final int e0 = d.getSize() - 1;<a name="line.1544"></a>
<span class="sourceLineNo">1545</span>                if (i0 &lt; -1 || i0 &gt; e0) {<a name="line.1545"></a>
<span class="sourceLineNo">1546</span>                        Arrays.fill(values, 0);<a name="line.1546"></a>
<span class="sourceLineNo">1547</span>                        return;<a name="line.1547"></a>
<span class="sourceLineNo">1548</span>                }<a name="line.1548"></a>
<span class="sourceLineNo">1549</span>                final double u0 = x0 - i0;<a name="line.1549"></a>
<span class="sourceLineNo">1550</span>        <a name="line.1550"></a>
<span class="sourceLineNo">1551</span>                if (u0 &gt; 0) {<a name="line.1551"></a>
<span class="sourceLineNo">1552</span>                        f1 = new double[is];<a name="line.1552"></a>
<span class="sourceLineNo">1553</span>                        if (i0 &gt;= 0)<a name="line.1553"></a>
<span class="sourceLineNo">1554</span>                                d.getDoubleArray(f1, i0);<a name="line.1554"></a>
<span class="sourceLineNo">1555</span>                        double t = 1 - u0;<a name="line.1555"></a>
<span class="sourceLineNo">1556</span>                        if (i0 == e0) {<a name="line.1556"></a>
<span class="sourceLineNo">1557</span>                                for (int j = 0; j &lt; is; j++)<a name="line.1557"></a>
<span class="sourceLineNo">1558</span>                                        values[j] = t * f1[j];<a name="line.1558"></a>
<span class="sourceLineNo">1559</span>                        } else {<a name="line.1559"></a>
<span class="sourceLineNo">1560</span>                                f2 = new double[is];<a name="line.1560"></a>
<span class="sourceLineNo">1561</span>                                d.getDoubleArray(f2, i0 + 1);<a name="line.1561"></a>
<span class="sourceLineNo">1562</span>                                for (int j = 0; j &lt; is; j++)<a name="line.1562"></a>
<span class="sourceLineNo">1563</span>                                        values[j] = t * f1[j] + u0 * f2[j];<a name="line.1563"></a>
<span class="sourceLineNo">1564</span>                        }<a name="line.1564"></a>
<span class="sourceLineNo">1565</span>                } else {<a name="line.1565"></a>
<span class="sourceLineNo">1566</span>                        if (i0 &gt;= 0)<a name="line.1566"></a>
<span class="sourceLineNo">1567</span>                                d.getDoubleArray(values, i0);<a name="line.1567"></a>
<span class="sourceLineNo">1568</span>                        else<a name="line.1568"></a>
<span class="sourceLineNo">1569</span>                                Arrays.fill(values, 0);<a name="line.1569"></a>
<span class="sourceLineNo">1570</span>                }<a name="line.1570"></a>
<span class="sourceLineNo">1571</span>        }<a name="line.1571"></a>
<span class="sourceLineNo">1572</span><a name="line.1572"></a>
<span class="sourceLineNo">1573</span>        /**<a name="line.1573"></a>
<span class="sourceLineNo">1574</span>         * Linearly interpolate a value at a point in a 2D dataset. The dataset is considered to have<a name="line.1574"></a>
<span class="sourceLineNo">1575</span>         * zero support outside its bounds. Thus points just outside are interpolated from the boundary<a name="line.1575"></a>
<span class="sourceLineNo">1576</span>         * value to zero.<a name="line.1576"></a>
<span class="sourceLineNo">1577</span>         * @param d input dataset<a name="line.1577"></a>
<span class="sourceLineNo">1578</span>         * @param x0 coordinate<a name="line.1578"></a>
<span class="sourceLineNo">1579</span>         * @param x1 coordinate<a name="line.1579"></a>
<span class="sourceLineNo">1580</span>         * @return bilinear interpolation<a name="line.1580"></a>
<span class="sourceLineNo">1581</span>         */<a name="line.1581"></a>
<span class="sourceLineNo">1582</span>        public static double interpolate(final Dataset d, final double x0, final double x1) {<a name="line.1582"></a>
<span class="sourceLineNo">1583</span>                final int[] s = d.getShape();<a name="line.1583"></a>
<span class="sourceLineNo">1584</span>                assert s.length == 2;<a name="line.1584"></a>
<span class="sourceLineNo">1585</span>        <a name="line.1585"></a>
<span class="sourceLineNo">1586</span>                final int e0 = s[0] - 1;<a name="line.1586"></a>
<span class="sourceLineNo">1587</span>                final int e1 = s[1] - 1;<a name="line.1587"></a>
<span class="sourceLineNo">1588</span>                final int i0 = (int) Math.floor(x0);<a name="line.1588"></a>
<span class="sourceLineNo">1589</span>                final int i1 = (int) Math.floor(x1);<a name="line.1589"></a>
<span class="sourceLineNo">1590</span>                final double u0 = x0 - i0;<a name="line.1590"></a>
<span class="sourceLineNo">1591</span>                final double u1 = x1 - i1;<a name="line.1591"></a>
<span class="sourceLineNo">1592</span>                if (i0 &lt; -1 || i0 &gt; e0 || i1 &lt; -1 || i1 &gt; e1)<a name="line.1592"></a>
<span class="sourceLineNo">1593</span>                        return 0;<a name="line.1593"></a>
<span class="sourceLineNo">1594</span><a name="line.1594"></a>
<span class="sourceLineNo">1595</span>                // use bilinear interpolation<a name="line.1595"></a>
<span class="sourceLineNo">1596</span>                double r = 0;<a name="line.1596"></a>
<span class="sourceLineNo">1597</span>                final double f1, f2, f3, f4;<a name="line.1597"></a>
<span class="sourceLineNo">1598</span>                f1 = i0 &lt; 0 || i1 &lt; 0 ? 0 : d.getDouble(i0, i1);<a name="line.1598"></a>
<span class="sourceLineNo">1599</span>                if (u1 &gt; 0) {<a name="line.1599"></a>
<span class="sourceLineNo">1600</span>                        if (u0 &gt; 0) {<a name="line.1600"></a>
<span class="sourceLineNo">1601</span>                                if (i0 == e0) {<a name="line.1601"></a>
<span class="sourceLineNo">1602</span>                                        f2 = 0;<a name="line.1602"></a>
<span class="sourceLineNo">1603</span>                                        f4 = 0;<a name="line.1603"></a>
<span class="sourceLineNo">1604</span>                                        f3 = i1 == e1 ? 0 : d.getDouble(i0, i1 + 1);<a name="line.1604"></a>
<span class="sourceLineNo">1605</span>                                } else {<a name="line.1605"></a>
<span class="sourceLineNo">1606</span>                                        f2 = i1 &lt; 0 ? 0 : d.getDouble(i0 + 1, i1);<a name="line.1606"></a>
<span class="sourceLineNo">1607</span>                                        if (i1 == e1) {<a name="line.1607"></a>
<span class="sourceLineNo">1608</span>                                                f4 = 0;<a name="line.1608"></a>
<span class="sourceLineNo">1609</span>                                                f3 = 0;<a name="line.1609"></a>
<span class="sourceLineNo">1610</span>                                        } else {<a name="line.1610"></a>
<span class="sourceLineNo">1611</span>                                                f4 = d.getDouble(i0 + 1, i1 + 1);<a name="line.1611"></a>
<span class="sourceLineNo">1612</span>                                                f3 = i0 &lt; 0 ? 0 : d.getDouble(i0, i1 + 1);<a name="line.1612"></a>
<span class="sourceLineNo">1613</span>                                        }<a name="line.1613"></a>
<span class="sourceLineNo">1614</span>                                }<a name="line.1614"></a>
<span class="sourceLineNo">1615</span>                                r = (1 - u0) * (1 - u1) * f1 + u0 * (1 - u1) * f2 + (1 - u0) * u1 * f3 + u0 * u1 * f4;<a name="line.1615"></a>
<span class="sourceLineNo">1616</span>                        } else {<a name="line.1616"></a>
<span class="sourceLineNo">1617</span>                                f3 = i0 &lt; 0 || i1 == e1 ? 0 : d.getDouble(i0, i1 + 1);<a name="line.1617"></a>
<span class="sourceLineNo">1618</span>                                r = (1 - u1) * f1 + u1 * f3;<a name="line.1618"></a>
<span class="sourceLineNo">1619</span>                        }<a name="line.1619"></a>
<span class="sourceLineNo">1620</span>                } else { // exactly on axis 1<a name="line.1620"></a>
<span class="sourceLineNo">1621</span>                        if (u0 &gt; 0) {<a name="line.1621"></a>
<span class="sourceLineNo">1622</span>                                f2 = i0 == e0 || i1 &lt; 0 ? 0 : d.getDouble(i0 + 1, i1);<a name="line.1622"></a>
<span class="sourceLineNo">1623</span>                                r = (1 - u0) * f1 + u0 * f2;<a name="line.1623"></a>
<span class="sourceLineNo">1624</span>                        } else { // exactly on axis 0<a name="line.1624"></a>
<span class="sourceLineNo">1625</span>                                r = f1;<a name="line.1625"></a>
<span class="sourceLineNo">1626</span>                        }<a name="line.1626"></a>
<span class="sourceLineNo">1627</span>                }<a name="line.1627"></a>
<span class="sourceLineNo">1628</span>                return r;<a name="line.1628"></a>
<span class="sourceLineNo">1629</span>        }<a name="line.1629"></a>
<span class="sourceLineNo">1630</span><a name="line.1630"></a>
<span class="sourceLineNo">1631</span>        /**<a name="line.1631"></a>
<span class="sourceLineNo">1632</span>         * Linearly interpolate a value at a point in a 2D dataset with a mask. The dataset is considered<a name="line.1632"></a>
<span class="sourceLineNo">1633</span>         * to have zero support outside its bounds. Thus points just outside are interpolated from the<a name="line.1633"></a>
<span class="sourceLineNo">1634</span>         * boundary value to zero.<a name="line.1634"></a>
<span class="sourceLineNo">1635</span>         * @param d input dataset<a name="line.1635"></a>
<span class="sourceLineNo">1636</span>         * @param m mask dataset<a name="line.1636"></a>
<span class="sourceLineNo">1637</span>         * @param x0 coordinate<a name="line.1637"></a>
<span class="sourceLineNo">1638</span>         * @param x1 coordinate<a name="line.1638"></a>
<span class="sourceLineNo">1639</span>         * @return bilinear interpolation<a name="line.1639"></a>
<span class="sourceLineNo">1640</span>         */<a name="line.1640"></a>
<span class="sourceLineNo">1641</span>        public static double interpolate(final Dataset d, final Dataset m, final double x0, final double x1) {<a name="line.1641"></a>
<span class="sourceLineNo">1642</span>                if (m == null)<a name="line.1642"></a>
<span class="sourceLineNo">1643</span>                        return interpolate(d, x0, x1);<a name="line.1643"></a>
<span class="sourceLineNo">1644</span>        <a name="line.1644"></a>
<span class="sourceLineNo">1645</span>                final int[] s = d.getShape();<a name="line.1645"></a>
<span class="sourceLineNo">1646</span>                assert s.length == 2;<a name="line.1646"></a>
<span class="sourceLineNo">1647</span>                assert m.getRank() == 2;<a name="line.1647"></a>
<span class="sourceLineNo">1648</span><a name="line.1648"></a>
<span class="sourceLineNo">1649</span>                final int e0 = s[0] - 1;<a name="line.1649"></a>
<span class="sourceLineNo">1650</span>                final int e1 = s[1] - 1;<a name="line.1650"></a>
<span class="sourceLineNo">1651</span>                final int i0 = (int) Math.floor(x0);<a name="line.1651"></a>
<span class="sourceLineNo">1652</span>                final int i1 = (int) Math.floor(x1);<a name="line.1652"></a>
<span class="sourceLineNo">1653</span>                final double u0 = x0 - i0;<a name="line.1653"></a>
<span class="sourceLineNo">1654</span>                final double u1 = x1 - i1;<a name="line.1654"></a>
<span class="sourceLineNo">1655</span>                if (i0 &lt; -1 || i0 &gt; e0 || i1 &lt; -1 || i1 &gt; e1)<a name="line.1655"></a>
<span class="sourceLineNo">1656</span>                        return 0;<a name="line.1656"></a>
<span class="sourceLineNo">1657</span><a name="line.1657"></a>
<span class="sourceLineNo">1658</span>                // use bilinear interpolation<a name="line.1658"></a>
<span class="sourceLineNo">1659</span>                double r = 0;<a name="line.1659"></a>
<span class="sourceLineNo">1660</span>                final double f1, f2, f3, f4;<a name="line.1660"></a>
<span class="sourceLineNo">1661</span>                f1 = i0 &lt; 0 || i1 &lt; 0 ? 0 : d.getDouble(i0, i1) * m.getDouble(i0, i1);<a name="line.1661"></a>
<span class="sourceLineNo">1662</span>                if (u1 &gt; 0) {<a name="line.1662"></a>
<span class="sourceLineNo">1663</span>                        if (i0 == e0) {<a name="line.1663"></a>
<span class="sourceLineNo">1664</span>                                f2 = 0;<a name="line.1664"></a>
<span class="sourceLineNo">1665</span>                                f4 = 0;<a name="line.1665"></a>
<span class="sourceLineNo">1666</span>                                f3 = i1 == e1 ? 0 : d.getDouble(i0, i1 + 1) * m.getDouble(i0, i1 + 1);<a name="line.1666"></a>
<span class="sourceLineNo">1667</span>                        } else {<a name="line.1667"></a>
<span class="sourceLineNo">1668</span>                                f2 = i1 &lt; 0 ? 0 : d.getDouble(i0 + 1, i1) * m.getDouble(i0 + 1, i1);<a name="line.1668"></a>
<span class="sourceLineNo">1669</span>                                if (i1 == e1) {<a name="line.1669"></a>
<span class="sourceLineNo">1670</span>                                        f4 = 0;<a name="line.1670"></a>
<span class="sourceLineNo">1671</span>                                        f3 = 0;<a name="line.1671"></a>
<span class="sourceLineNo">1672</span>                                } else {<a name="line.1672"></a>
<span class="sourceLineNo">1673</span>                                        f4 = d.getDouble(i0 + 1, i1 + 1) * m.getDouble(i0 + 1, i1 + 1);<a name="line.1673"></a>
<span class="sourceLineNo">1674</span>                                        f3 = i0 &lt; 0 ? 0 : d.getDouble(i0, i1 + 1) * m.getDouble(i0, i1 + 1);<a name="line.1674"></a>
<span class="sourceLineNo">1675</span>                                }<a name="line.1675"></a>
<span class="sourceLineNo">1676</span>                        }<a name="line.1676"></a>
<span class="sourceLineNo">1677</span>                        r = (1 - u0) * (1 - u1) * f1 + u0 * (1 - u1) * f2 + (1 - u0) * u1 * f3 + u0 * u1 * f4;<a name="line.1677"></a>
<span class="sourceLineNo">1678</span>                } else { // exactly on axis 1<a name="line.1678"></a>
<span class="sourceLineNo">1679</span>                        if (u0 &gt; 0) {<a name="line.1679"></a>
<span class="sourceLineNo">1680</span>                                f2 = i0 == e0 || i1 &lt; 0 ? 0 : d.getDouble(i0 + 1, i1) * m.getDouble(i0 + 1, i1);<a name="line.1680"></a>
<span class="sourceLineNo">1681</span>                                r = (1 - u0) * f1 + u0 * f2;<a name="line.1681"></a>
<span class="sourceLineNo">1682</span>                        } else { // exactly on axis 0<a name="line.1682"></a>
<span class="sourceLineNo">1683</span>                                r = f1;<a name="line.1683"></a>
<span class="sourceLineNo">1684</span>                        }<a name="line.1684"></a>
<span class="sourceLineNo">1685</span>                }<a name="line.1685"></a>
<span class="sourceLineNo">1686</span>                return r;<a name="line.1686"></a>
<span class="sourceLineNo">1687</span>        }<a name="line.1687"></a>
<span class="sourceLineNo">1688</span><a name="line.1688"></a>
<span class="sourceLineNo">1689</span>        /**<a name="line.1689"></a>
<span class="sourceLineNo">1690</span>         * Linearly interpolate an array of values at a point in a compound 2D dataset. The dataset is<a name="line.1690"></a>
<span class="sourceLineNo">1691</span>         * considered to have zero support outside its bounds. Thus points just outside are interpolated<a name="line.1691"></a>
<span class="sourceLineNo">1692</span>         * from the boundary value to zero.<a name="line.1692"></a>
<span class="sourceLineNo">1693</span>         * @param values bilinear interpolated array<a name="line.1693"></a>
<span class="sourceLineNo">1694</span>         * @param d<a name="line.1694"></a>
<span class="sourceLineNo">1695</span>         * @param x0<a name="line.1695"></a>
<span class="sourceLineNo">1696</span>         * @param x1<a name="line.1696"></a>
<span class="sourceLineNo">1697</span>         */<a name="line.1697"></a>
<span class="sourceLineNo">1698</span>        public static void interpolate(final double[] values, final CompoundDataset d, final double x0, final double x1) {<a name="line.1698"></a>
<span class="sourceLineNo">1699</span>                final int[] s = d.getShapeRef();<a name="line.1699"></a>
<span class="sourceLineNo">1700</span>                assert s.length == 2;<a name="line.1700"></a>
<span class="sourceLineNo">1701</span><a name="line.1701"></a>
<span class="sourceLineNo">1702</span>                final int is = d.getElementsPerItem();<a name="line.1702"></a>
<span class="sourceLineNo">1703</span>                if (is != values.length)<a name="line.1703"></a>
<span class="sourceLineNo">1704</span>                        throw new IllegalArgumentException("Output array length must match elements in item");<a name="line.1704"></a>
<span class="sourceLineNo">1705</span><a name="line.1705"></a>
<span class="sourceLineNo">1706</span>                final int e0 = s[0] - 1;<a name="line.1706"></a>
<span class="sourceLineNo">1707</span>                final int e1 = s[1] - 1;<a name="line.1707"></a>
<span class="sourceLineNo">1708</span>                final int i0 = (int) Math.floor(x0);<a name="line.1708"></a>
<span class="sourceLineNo">1709</span>                final int i1 = (int) Math.floor(x1);<a name="line.1709"></a>
<span class="sourceLineNo">1710</span>                final double u0 = x0 - i0;<a name="line.1710"></a>
<span class="sourceLineNo">1711</span>                final double u1 = x1 - i1;<a name="line.1711"></a>
<span class="sourceLineNo">1712</span>                if (i0 &lt; -1 || i0 &gt; e0 || i1 &lt; -1 || i1 &gt; e1) {<a name="line.1712"></a>
<span class="sourceLineNo">1713</span>                        Arrays.fill(values, 0);<a name="line.1713"></a>
<span class="sourceLineNo">1714</span>                        return;<a name="line.1714"></a>
<span class="sourceLineNo">1715</span>                }<a name="line.1715"></a>
<span class="sourceLineNo">1716</span>                // use bilinear interpolation<a name="line.1716"></a>
<span class="sourceLineNo">1717</span>                double[] f1 = new double[is];<a name="line.1717"></a>
<span class="sourceLineNo">1718</span>                if (i0 &gt;= 0 &amp;&amp; i1 &gt;= 0)<a name="line.1718"></a>
<span class="sourceLineNo">1719</span>                        d.getDoubleArray(f1, i0, i1);<a name="line.1719"></a>
<span class="sourceLineNo">1720</span>        <a name="line.1720"></a>
<span class="sourceLineNo">1721</span>                if (u1 &gt; 0) {<a name="line.1721"></a>
<span class="sourceLineNo">1722</span>                        if (u0 &gt; 0) {<a name="line.1722"></a>
<span class="sourceLineNo">1723</span>                                double[] f2 = new double[is];<a name="line.1723"></a>
<span class="sourceLineNo">1724</span>                                double[] f3 = new double[is];<a name="line.1724"></a>
<span class="sourceLineNo">1725</span>                                double[] f4 = new double[is];<a name="line.1725"></a>
<span class="sourceLineNo">1726</span>                                if (i0 != e0) {<a name="line.1726"></a>
<span class="sourceLineNo">1727</span>                                        if (i1 != e1)<a name="line.1727"></a>
<span class="sourceLineNo">1728</span>                                                d.getDoubleArray(f3, i0 + 1, i1 + 1);<a name="line.1728"></a>
<span class="sourceLineNo">1729</span>                                        if (i1 &gt;= 0)<a name="line.1729"></a>
<span class="sourceLineNo">1730</span>                                                d.getDoubleArray(f4, i0 + 1, i1);<a name="line.1730"></a>
<span class="sourceLineNo">1731</span>                                }<a name="line.1731"></a>
<span class="sourceLineNo">1732</span>                                if (i0 &gt;= 0 &amp;&amp; i1 != e1)<a name="line.1732"></a>
<span class="sourceLineNo">1733</span>                                        d.getDoubleArray(f2, i0, i1 + 1);<a name="line.1733"></a>
<span class="sourceLineNo">1734</span>                                final double t0 = 1 - u0;<a name="line.1734"></a>
<span class="sourceLineNo">1735</span>                                final double t1 = 1 - u1;<a name="line.1735"></a>
<span class="sourceLineNo">1736</span>                                final double w1 = t0 * t1;<a name="line.1736"></a>
<span class="sourceLineNo">1737</span>                                final double w2 = t0 * u1;<a name="line.1737"></a>
<span class="sourceLineNo">1738</span>                                final double w3 = u0 * u1;<a name="line.1738"></a>
<span class="sourceLineNo">1739</span>                                final double w4 = u0 * t1;<a name="line.1739"></a>
<span class="sourceLineNo">1740</span>                                for (int j = 0; j &lt; is; j++)<a name="line.1740"></a>
<span class="sourceLineNo">1741</span>                                        values[j] = w1 * f1[j] + w2 * f2[j] + w3 * f3[j] + w4 * f4[j];<a name="line.1741"></a>
<span class="sourceLineNo">1742</span>                        } else {<a name="line.1742"></a>
<span class="sourceLineNo">1743</span>                                double[] f2 = new double[is];<a name="line.1743"></a>
<span class="sourceLineNo">1744</span>                                if (i0 &gt;= 0 &amp;&amp; i1 != e1)<a name="line.1744"></a>
<span class="sourceLineNo">1745</span>                                        d.getDoubleArray(f2, i0, i1 + 1);<a name="line.1745"></a>
<span class="sourceLineNo">1746</span>                                final double t1 = 1 - u1;<a name="line.1746"></a>
<span class="sourceLineNo">1747</span>                                for (int j = 0; j &lt; is; j++)<a name="line.1747"></a>
<span class="sourceLineNo">1748</span>                                        values[j] = t1 * f1[j] + u1 * f2[j];<a name="line.1748"></a>
<span class="sourceLineNo">1749</span>                        }<a name="line.1749"></a>
<span class="sourceLineNo">1750</span>                } else { // exactly on axis 1<a name="line.1750"></a>
<span class="sourceLineNo">1751</span>                        if (u0 &gt; 0) {<a name="line.1751"></a>
<span class="sourceLineNo">1752</span>                                double[] f4 = new double[is];<a name="line.1752"></a>
<span class="sourceLineNo">1753</span>                                if (i0 != e0 &amp;&amp; i1 &gt;= 0)<a name="line.1753"></a>
<span class="sourceLineNo">1754</span>                                        d.getDoubleArray(f4, i0 + 1, i1);<a name="line.1754"></a>
<span class="sourceLineNo">1755</span>                                final double t0 = 1 - u0;<a name="line.1755"></a>
<span class="sourceLineNo">1756</span>                                for (int j = 0; j &lt; is; j++)<a name="line.1756"></a>
<span class="sourceLineNo">1757</span>                                        values[j] = t0 * f1[j] + u0 * f4[j];<a name="line.1757"></a>
<span class="sourceLineNo">1758</span>                        } else { // exactly on axis 0<a name="line.1758"></a>
<span class="sourceLineNo">1759</span>                                if (i0 &gt;= 0 &amp;&amp; i1 &gt;= 0)<a name="line.1759"></a>
<span class="sourceLineNo">1760</span>                                        d.getDoubleArray(values, i0, i1);<a name="line.1760"></a>
<span class="sourceLineNo">1761</span>                                else<a name="line.1761"></a>
<span class="sourceLineNo">1762</span>                                        Arrays.fill(values, 0);<a name="line.1762"></a>
<span class="sourceLineNo">1763</span>                        }<a name="line.1763"></a>
<span class="sourceLineNo">1764</span>                }<a name="line.1764"></a>
<span class="sourceLineNo">1765</span>        }<a name="line.1765"></a>
<span class="sourceLineNo">1766</span><a name="line.1766"></a>
<span class="sourceLineNo">1767</span>        /**<a name="line.1767"></a>
<span class="sourceLineNo">1768</span>         * Linearly interpolate a value at a point in a n-D dataset. The dataset is considered to have<a name="line.1768"></a>
<span class="sourceLineNo">1769</span>         * zero support outside its bounds. Thus points just outside are interpolated from the boundary<a name="line.1769"></a>
<span class="sourceLineNo">1770</span>         * value to zero. The number of coordinates must match the rank of the dataset.<a name="line.1770"></a>
<span class="sourceLineNo">1771</span>         * @param d input dataset<a name="line.1771"></a>
<span class="sourceLineNo">1772</span>         * @param x coordinates<a name="line.1772"></a>
<span class="sourceLineNo">1773</span>         * @return interpolated value<a name="line.1773"></a>
<span class="sourceLineNo">1774</span>         */<a name="line.1774"></a>
<span class="sourceLineNo">1775</span>        public static double interpolate(final Dataset d, final double... x) {<a name="line.1775"></a>
<span class="sourceLineNo">1776</span>                return interpolate(d, null, x);<a name="line.1776"></a>
<span class="sourceLineNo">1777</span>        }<a name="line.1777"></a>
<span class="sourceLineNo">1778</span><a name="line.1778"></a>
<span class="sourceLineNo">1779</span>        /**<a name="line.1779"></a>
<span class="sourceLineNo">1780</span>         * Linearly interpolate a value at a point in a n-D dataset with a mask. The dataset is considered to have<a name="line.1780"></a>
<span class="sourceLineNo">1781</span>         * zero support outside its bounds. Thus points just outside are interpolated from the boundary<a name="line.1781"></a>
<span class="sourceLineNo">1782</span>         * value to zero. The number of coordinates must match the rank of the dataset.<a name="line.1782"></a>
<span class="sourceLineNo">1783</span>         * @param d input dataset<a name="line.1783"></a>
<span class="sourceLineNo">1784</span>         * @param m mask dataset (can be null)<a name="line.1784"></a>
<span class="sourceLineNo">1785</span>         * @param x coordinates<a name="line.1785"></a>
<span class="sourceLineNo">1786</span>         * @return interpolated value<a name="line.1786"></a>
<span class="sourceLineNo">1787</span>         */<a name="line.1787"></a>
<span class="sourceLineNo">1788</span>        public static double interpolate(final Dataset d, final Dataset m, final double... x) {<a name="line.1788"></a>
<span class="sourceLineNo">1789</span>                int r = d.getRank();<a name="line.1789"></a>
<span class="sourceLineNo">1790</span>                if (r != x.length) {<a name="line.1790"></a>
<span class="sourceLineNo">1791</span>                        throw new IllegalArgumentException("Number of coordinates must be equal to rank of dataset");<a name="line.1791"></a>
<span class="sourceLineNo">1792</span>                }<a name="line.1792"></a>
<span class="sourceLineNo">1793</span><a name="line.1793"></a>
<span class="sourceLineNo">1794</span>                switch (r) {<a name="line.1794"></a>
<span class="sourceLineNo">1795</span>                case 1:<a name="line.1795"></a>
<span class="sourceLineNo">1796</span>                        return m == null ? interpolate(d, x[0]) : interpolate(d, m, x[0]);<a name="line.1796"></a>
<span class="sourceLineNo">1797</span>                case 2:<a name="line.1797"></a>
<span class="sourceLineNo">1798</span>                        return m == null ? interpolate(d, x[0], x[1]) : interpolate(d, m, x[0], x[1]);<a name="line.1798"></a>
<span class="sourceLineNo">1799</span>                }<a name="line.1799"></a>
<span class="sourceLineNo">1800</span><a name="line.1800"></a>
<span class="sourceLineNo">1801</span>                if (m != null &amp;&amp; r != m.getRank()) {<a name="line.1801"></a>
<span class="sourceLineNo">1802</span>                        throw new IllegalArgumentException("Rank of mask dataset must be equal to rank of dataset");<a name="line.1802"></a>
<span class="sourceLineNo">1803</span>                }<a name="line.1803"></a>
<span class="sourceLineNo">1804</span><a name="line.1804"></a>
<span class="sourceLineNo">1805</span>                // now do it iteratively<a name="line.1805"></a>
<span class="sourceLineNo">1806</span>                int[] l = new int[r];       // lower indexes<a name="line.1806"></a>
<span class="sourceLineNo">1807</span>                double[] f = new double[r]; // fractions<a name="line.1807"></a>
<span class="sourceLineNo">1808</span>                for (int i = 0; i &lt; r; i++) {<a name="line.1808"></a>
<span class="sourceLineNo">1809</span>                        double xi = x[i];<a name="line.1809"></a>
<span class="sourceLineNo">1810</span>                        l[i] = (int) Math.floor(xi);<a name="line.1810"></a>
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<span class="sourceLineNo">1813</span><a name="line.1813"></a>
<span class="sourceLineNo">1814</span>                int[] s = d.getShape();<a name="line.1814"></a>
<span class="sourceLineNo">1815</span>                <a name="line.1815"></a>
<span class="sourceLineNo">1816</span>                int n = 1 &lt;&lt; r;<a name="line.1816"></a>
<span class="sourceLineNo">1817</span>                double[] results = new double[n];<a name="line.1817"></a>
<span class="sourceLineNo">1818</span><a name="line.1818"></a>
<span class="sourceLineNo">1819</span>                // iterate over permutations {l} and {l+1}<a name="line.1819"></a>
<span class="sourceLineNo">1820</span>                int[] twos = new int[r];<a name="line.1820"></a>
<span class="sourceLineNo">1821</span>                Arrays.fill(twos, 2);<a name="line.1821"></a>
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<span class="sourceLineNo">1823</span>                int[] ip = it.getPos();<a name="line.1823"></a>
<span class="sourceLineNo">1824</span>                int j = 0;<a name="line.1824"></a>
<span class="sourceLineNo">1825</span>                if (m == null) {<a name="line.1825"></a>
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<span class="sourceLineNo">1827</span>                                int[] p = l.clone();<a name="line.1827"></a>
<span class="sourceLineNo">1828</span>                                boolean omit = false;<a name="line.1828"></a>
<span class="sourceLineNo">1829</span>                                for (int i = 0; i &lt; r; i++) {<a name="line.1829"></a>
<span class="sourceLineNo">1830</span>                                        int pi = p[i] + ip[i];<a name="line.1830"></a>
<span class="sourceLineNo">1831</span>                                        if (pi &lt; 0 || pi &gt;= s[i]) {<a name="line.1831"></a>
<span class="sourceLineNo">1832</span>                                                omit = true;<a name="line.1832"></a>
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<span class="sourceLineNo">1835</span>                                        p[i] = pi;<a name="line.1835"></a>
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<span class="sourceLineNo">1837</span>                                results[j++] = omit ? 0 : d.getDouble(p);<a name="line.1837"></a>
<span class="sourceLineNo">1838</span>                        }<a name="line.1838"></a>
<span class="sourceLineNo">1839</span>                } else {<a name="line.1839"></a>
<span class="sourceLineNo">1840</span>                        while (it.hasNext()) {<a name="line.1840"></a>
<span class="sourceLineNo">1841</span>                                int[] p = l.clone();<a name="line.1841"></a>
<span class="sourceLineNo">1842</span>                                boolean omit = false;<a name="line.1842"></a>
<span class="sourceLineNo">1843</span>                                for (int i = 0; i &lt; r; i++) {<a name="line.1843"></a>
<span class="sourceLineNo">1844</span>                                        int pi = p[i] + ip[i];<a name="line.1844"></a>
<span class="sourceLineNo">1845</span>                                        if (pi &lt; 0 || pi &gt;= s[i]) {<a name="line.1845"></a>
<span class="sourceLineNo">1846</span>                                                omit = true;<a name="line.1846"></a>
<span class="sourceLineNo">1847</span>                                                break;<a name="line.1847"></a>
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<span class="sourceLineNo">1849</span>                                        p[i] = pi;<a name="line.1849"></a>
<span class="sourceLineNo">1850</span>                                }<a name="line.1850"></a>
<span class="sourceLineNo">1851</span>                                results[j++] = omit ? 0 : d.getDouble(p) * m.getDouble(p);<a name="line.1851"></a>
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<span class="sourceLineNo">1853</span>                }<a name="line.1853"></a>
<span class="sourceLineNo">1854</span><a name="line.1854"></a>
<span class="sourceLineNo">1855</span>                // reduce recursively<a name="line.1855"></a>
<span class="sourceLineNo">1856</span>                for (int i = r - 1; i &gt;= 0; i--) {<a name="line.1856"></a>
<span class="sourceLineNo">1857</span>                        results = combine(results, f[i], 1 &lt;&lt; i);<a name="line.1857"></a>
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<span class="sourceLineNo">1859</span>                return results[0];<a name="line.1859"></a>
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<span class="sourceLineNo">1861</span><a name="line.1861"></a>
<span class="sourceLineNo">1862</span>        private static double[] combine(double[] values, double f, int n) {<a name="line.1862"></a>
<span class="sourceLineNo">1863</span>                double g = 1 - f;<a name="line.1863"></a>
<span class="sourceLineNo">1864</span>                double[] results = new double[n];<a name="line.1864"></a>
<span class="sourceLineNo">1865</span>                for (int j = 0; j &lt; n; j++) {<a name="line.1865"></a>
<span class="sourceLineNo">1866</span>                        int tj = 2 * j;<a name="line.1866"></a>
<span class="sourceLineNo">1867</span>                        results[j] = g * values[tj] + f * values[tj + 1];<a name="line.1867"></a>
<span class="sourceLineNo">1868</span>                }<a name="line.1868"></a>
<span class="sourceLineNo">1869</span><a name="line.1869"></a>
<span class="sourceLineNo">1870</span>                return results;<a name="line.1870"></a>
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<span class="sourceLineNo">1872</span><a name="line.1872"></a>
<span class="sourceLineNo">1873</span>        /**<a name="line.1873"></a>
<span class="sourceLineNo">1874</span>         * Linearly interpolate an array of values at a point in a compound n-D dataset. The dataset is<a name="line.1874"></a>
<span class="sourceLineNo">1875</span>         * considered to have zero support outside its bounds. Thus points just outside are interpolated<a name="line.1875"></a>
<span class="sourceLineNo">1876</span>         * from the boundary value to zero.<a name="line.1876"></a>
<span class="sourceLineNo">1877</span>         * @param values linearly interpolated array<a name="line.1877"></a>
<span class="sourceLineNo">1878</span>         * @param d<a name="line.1878"></a>
<span class="sourceLineNo">1879</span>         * @param x<a name="line.1879"></a>
<span class="sourceLineNo">1880</span>         */<a name="line.1880"></a>
<span class="sourceLineNo">1881</span>        public static void interpolate(final double[] values, final CompoundDataset d, final double... x) {<a name="line.1881"></a>
<span class="sourceLineNo">1882</span>                int r = d.getRank();<a name="line.1882"></a>
<span class="sourceLineNo">1883</span>                if (r != x.length) {<a name="line.1883"></a>
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<span class="sourceLineNo">1886</span><a name="line.1886"></a>
<span class="sourceLineNo">1887</span>                switch (r) {<a name="line.1887"></a>
<span class="sourceLineNo">1888</span>                case 1:<a name="line.1888"></a>
<span class="sourceLineNo">1889</span>                        interpolate(values, d, x[0]);<a name="line.1889"></a>
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<span class="sourceLineNo">1891</span>                case 2:<a name="line.1891"></a>
<span class="sourceLineNo">1892</span>                        interpolate(values, d, x[0], x[1]);<a name="line.1892"></a>
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<span class="sourceLineNo">1895</span><a name="line.1895"></a>
<span class="sourceLineNo">1896</span>                final int is = d.getElementsPerItem();<a name="line.1896"></a>
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<span class="sourceLineNo">1898</span>                        throw new IllegalArgumentException("Output array length must match elements in item");<a name="line.1898"></a>
<span class="sourceLineNo">1899</span><a name="line.1899"></a>
<span class="sourceLineNo">1900</span>                // now do it iteratively<a name="line.1900"></a>
<span class="sourceLineNo">1901</span>                int[] l = new int[r];       // lower indexes<a name="line.1901"></a>
<span class="sourceLineNo">1902</span>                double[] f = new double[r]; // fractions<a name="line.1902"></a>
<span class="sourceLineNo">1903</span>                for (int i = 0; i &lt; r; i++) {<a name="line.1903"></a>
<span class="sourceLineNo">1904</span>                        double xi = x[i];<a name="line.1904"></a>
<span class="sourceLineNo">1905</span>                        l[i] = (int) Math.floor(xi);<a name="line.1905"></a>
<span class="sourceLineNo">1906</span>                        f[i] = xi - l[i];<a name="line.1906"></a>
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<span class="sourceLineNo">1908</span><a name="line.1908"></a>
<span class="sourceLineNo">1909</span>                int[] s = d.getShape();<a name="line.1909"></a>
<span class="sourceLineNo">1910</span>                <a name="line.1910"></a>
<span class="sourceLineNo">1911</span>                int n = 1 &lt;&lt; r;<a name="line.1911"></a>
<span class="sourceLineNo">1912</span>                double[][] results = new double[n][is];<a name="line.1912"></a>
<span class="sourceLineNo">1913</span><a name="line.1913"></a>
<span class="sourceLineNo">1914</span>                // iterate over permutations {l} and {l+1}<a name="line.1914"></a>
<span class="sourceLineNo">1915</span>                int[] twos = new int[r];<a name="line.1915"></a>
<span class="sourceLineNo">1916</span>                Arrays.fill(twos, 2);<a name="line.1916"></a>
<span class="sourceLineNo">1917</span>                PositionIterator it = new PositionIterator(twos);<a name="line.1917"></a>
<span class="sourceLineNo">1918</span>                int[] ip = it.getPos();<a name="line.1918"></a>
<span class="sourceLineNo">1919</span>                int j = 0;<a name="line.1919"></a>
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<span class="sourceLineNo">1921</span>                        int[] p = l.clone();<a name="line.1921"></a>
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<span class="sourceLineNo">1923</span>                        for (int i = 0; i &lt; r; i++) {<a name="line.1923"></a>
<span class="sourceLineNo">1924</span>                                int pi = p[i] + ip[i];<a name="line.1924"></a>
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<span class="sourceLineNo">1929</span>                                p[i] = pi;<a name="line.1929"></a>
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<span class="sourceLineNo">1931</span>                        if (!omit) {<a name="line.1931"></a>
<span class="sourceLineNo">1932</span>                                d.getDoubleArray(results[j++], p);<a name="line.1932"></a>
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<span class="sourceLineNo">1934</span>                }<a name="line.1934"></a>
<span class="sourceLineNo">1935</span><a name="line.1935"></a>
<span class="sourceLineNo">1936</span>                // reduce recursively<a name="line.1936"></a>
<span class="sourceLineNo">1937</span>                for (int i = r - 1; i &gt;= 0; i--) {<a name="line.1937"></a>
<span class="sourceLineNo">1938</span>                        results = combineArray(is, results, f[i], 1 &lt;&lt; i);<a name="line.1938"></a>
<span class="sourceLineNo">1939</span>                }<a name="line.1939"></a>
<span class="sourceLineNo">1940</span>                for (int k = 0; k &lt; is; k++) {<a name="line.1940"></a>
<span class="sourceLineNo">1941</span>                        values[k] = results[0][k];<a name="line.1941"></a>
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<span class="sourceLineNo">1944</span><a name="line.1944"></a>
<span class="sourceLineNo">1945</span>        private static double[][] combineArray(int is, double[][] values, double f, int n) {<a name="line.1945"></a>
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<span class="sourceLineNo">1947</span>                double[][] results = new double[n][is];<a name="line.1947"></a>
<span class="sourceLineNo">1948</span>                for (int j = 0; j &lt; n; j++) {<a name="line.1948"></a>
<span class="sourceLineNo">1949</span>                        int tj = 2 * j;<a name="line.1949"></a>
<span class="sourceLineNo">1950</span>                        for (int k = 0; k &lt; is; k++) {<a name="line.1950"></a>
<span class="sourceLineNo">1951</span>                                results[j][k] = g * values[tj][k] + f * values[tj + 1][k];<a name="line.1951"></a>
<span class="sourceLineNo">1952</span>                        }<a name="line.1952"></a>
<span class="sourceLineNo">1953</span>                }<a name="line.1953"></a>
<span class="sourceLineNo">1954</span><a name="line.1954"></a>
<span class="sourceLineNo">1955</span>                return results;<a name="line.1955"></a>
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<span class="sourceLineNo">1957</span><a name="line.1957"></a>
<span class="sourceLineNo">1958</span>        /**<a name="line.1958"></a>
<span class="sourceLineNo">1959</span>         * Linearly interpolate a value at a point in a 1D dataset. The dataset is considered to have<a name="line.1959"></a>
<span class="sourceLineNo">1960</span>         * zero support outside its bounds. Thus points just outside are interpolated from the boundary<a name="line.1960"></a>
<span class="sourceLineNo">1961</span>         * value to zero.<a name="line.1961"></a>
<span class="sourceLineNo">1962</span>         * @param d input dataset<a name="line.1962"></a>
<span class="sourceLineNo">1963</span>         * @param x0 coordinate<a name="line.1963"></a>
<span class="sourceLineNo">1964</span>         * @return interpolated value<a name="line.1964"></a>
<span class="sourceLineNo">1965</span>         * @deprecated Use {@link #interpolate(Dataset, double)}<a name="line.1965"></a>
<span class="sourceLineNo">1966</span>         */<a name="line.1966"></a>
<span class="sourceLineNo">1967</span>        @Deprecated<a name="line.1967"></a>
<span class="sourceLineNo">1968</span>        public static double getLinear(final IDataset d, final double x0) {<a name="line.1968"></a>
<span class="sourceLineNo">1969</span>                return interpolate(DatasetUtils.convertToDataset(d), x0);<a name="line.1969"></a>
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<span class="sourceLineNo">1971</span><a name="line.1971"></a>
<span class="sourceLineNo">1972</span>        /**<a name="line.1972"></a>
<span class="sourceLineNo">1973</span>         * Linearly interpolate a value at a point in a compound 1D dataset. The dataset is considered<a name="line.1973"></a>
<span class="sourceLineNo">1974</span>         * to have zero support outside its bounds. Thus points just outside are interpolated from the<a name="line.1974"></a>
<span class="sourceLineNo">1975</span>         * boundary value to zero.<a name="line.1975"></a>
<span class="sourceLineNo">1976</span>         * @param values interpolated array<a name="line.1976"></a>
<span class="sourceLineNo">1977</span>         * @param d input dataset<a name="line.1977"></a>
<span class="sourceLineNo">1978</span>         * @param x0 coordinate<a name="line.1978"></a>
<span class="sourceLineNo">1979</span>         * @deprecated Use {@link #interpolate(double[], CompoundDataset, double)}<a name="line.1979"></a>
<span class="sourceLineNo">1980</span>         */<a name="line.1980"></a>
<span class="sourceLineNo">1981</span>        @Deprecated<a name="line.1981"></a>
<span class="sourceLineNo">1982</span>        public static void getLinear(final double[] values, final CompoundDataset d, final double x0) {<a name="line.1982"></a>
<span class="sourceLineNo">1983</span>                interpolate(values, d, x0);<a name="line.1983"></a>
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<span class="sourceLineNo">1986</span>        /**<a name="line.1986"></a>
<span class="sourceLineNo">1987</span>         * Interpolated a value from 2D dataset<a name="line.1987"></a>
<span class="sourceLineNo">1988</span>         * @param d input dataset<a name="line.1988"></a>
<span class="sourceLineNo">1989</span>         * @param x0 coordinate<a name="line.1989"></a>
<span class="sourceLineNo">1990</span>         * @param x1 coordinate<a name="line.1990"></a>
<span class="sourceLineNo">1991</span>         * @return bilinear interpolation<a name="line.1991"></a>
<span class="sourceLineNo">1992</span>         * @deprecated Use {@link #interpolate(Dataset, double, double)}<a name="line.1992"></a>
<span class="sourceLineNo">1993</span>         */<a name="line.1993"></a>
<span class="sourceLineNo">1994</span>        @Deprecated<a name="line.1994"></a>
<span class="sourceLineNo">1995</span>        public static double getBilinear(final IDataset d, final double x0, final double x1) {<a name="line.1995"></a>
<span class="sourceLineNo">1996</span>                return interpolate(DatasetUtils.convertToDataset(d), x0, x1);<a name="line.1996"></a>
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<span class="sourceLineNo">1998</span><a name="line.1998"></a>
<span class="sourceLineNo">1999</span>        /**<a name="line.1999"></a>
<span class="sourceLineNo">2000</span>         * Interpolated a value from 2D dataset with mask<a name="line.2000"></a>
<span class="sourceLineNo">2001</span>         * @param d input dataset<a name="line.2001"></a>
<span class="sourceLineNo">2002</span>         * @param m mask dataset<a name="line.2002"></a>
<span class="sourceLineNo">2003</span>         * @param x0 coordinate<a name="line.2003"></a>
<span class="sourceLineNo">2004</span>         * @param x1 coordinate<a name="line.2004"></a>
<span class="sourceLineNo">2005</span>         * @return bilinear interpolation<a name="line.2005"></a>
<span class="sourceLineNo">2006</span>         * @deprecated Use {@link #interpolate(Dataset, Dataset, double, double)}<a name="line.2006"></a>
<span class="sourceLineNo">2007</span>         */<a name="line.2007"></a>
<span class="sourceLineNo">2008</span>        @Deprecated<a name="line.2008"></a>
<span class="sourceLineNo">2009</span>        public static double getBilinear(final IDataset d, final IDataset m, final double x0, final double x1) {<a name="line.2009"></a>
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<span class="sourceLineNo">2012</span><a name="line.2012"></a>
<span class="sourceLineNo">2013</span>        /**<a name="line.2013"></a>
<span class="sourceLineNo">2014</span>         * Interpolated a value from 2D compound dataset<a name="line.2014"></a>
<span class="sourceLineNo">2015</span>         * @param values bilinear interpolated array<a name="line.2015"></a>
<span class="sourceLineNo">2016</span>         * @param d<a name="line.2016"></a>
<span class="sourceLineNo">2017</span>         * @param x0<a name="line.2017"></a>
<span class="sourceLineNo">2018</span>         * @param x1<a name="line.2018"></a>
<span class="sourceLineNo">2019</span>         * @deprecated Use {@link #interpolate(double[], CompoundDataset, double, double)}<a name="line.2019"></a>
<span class="sourceLineNo">2020</span>         */<a name="line.2020"></a>
<span class="sourceLineNo">2021</span>        @Deprecated<a name="line.2021"></a>
<span class="sourceLineNo">2022</span>        public static void getBilinear(final double[] values, final CompoundDataset d, final double x0, final double x1) {<a name="line.2022"></a>
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<span class="sourceLineNo">2026</span>        /**<a name="line.2026"></a>
<span class="sourceLineNo">2027</span>         * generate binomial coefficients with negative sign:<a name="line.2027"></a>
<span class="sourceLineNo">2028</span>         * &lt;p&gt;<a name="line.2028"></a>
<span class="sourceLineNo">2029</span>         * &lt;pre&gt;<a name="line.2029"></a>
<span class="sourceLineNo">2030</span>         *  (-1)^i n! / ( i! (n-i)! )<a name="line.2030"></a>
<span class="sourceLineNo">2031</span>         * &lt;/pre&gt;<a name="line.2031"></a>
<span class="sourceLineNo">2032</span>         * @param n<a name="line.2032"></a>
<span class="sourceLineNo">2033</span>         * @return array of coefficients<a name="line.2033"></a>
<span class="sourceLineNo">2034</span>         */<a name="line.2034"></a>
<span class="sourceLineNo">2035</span>        private static int[] bincoeff(final int n) {<a name="line.2035"></a>
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<span class="sourceLineNo">2037</span>                final int hn = n/2;<a name="line.2037"></a>
<span class="sourceLineNo">2038</span><a name="line.2038"></a>
<span class="sourceLineNo">2039</span>                int bc = 1;<a name="line.2039"></a>
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<span class="sourceLineNo">2041</span>                for (int i = 1; i &lt;= hn; i++) {<a name="line.2041"></a>
<span class="sourceLineNo">2042</span>                        bc = -(bc*(n-i+1))/i;<a name="line.2042"></a>
<span class="sourceLineNo">2043</span>                        b[i] = bc;<a name="line.2043"></a>
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<span class="sourceLineNo">2045</span>                if (n % 2 != 0) {<a name="line.2045"></a>
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<span class="sourceLineNo">2047</span>                                b[i] = -b[n-i];<a name="line.2047"></a>
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<span class="sourceLineNo">2049</span>                } else {<a name="line.2049"></a>
<span class="sourceLineNo">2050</span>                        for (int i = hn+1; i &lt;= n; i++) {<a name="line.2050"></a>
<span class="sourceLineNo">2051</span>                                b[i] = b[n-i];<a name="line.2051"></a>
<span class="sourceLineNo">2052</span>                        }<a name="line.2052"></a>
<span class="sourceLineNo">2053</span>                }<a name="line.2053"></a>
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<span class="sourceLineNo">2057</span>        /**<a name="line.2057"></a>
<span class="sourceLineNo">2058</span>         * 1st order discrete difference of dataset along flattened dataset using finite difference<a name="line.2058"></a>
<span class="sourceLineNo">2059</span>         * @param a is 1d dataset<a name="line.2059"></a>
<span class="sourceLineNo">2060</span>         * @param out is 1d dataset<a name="line.2060"></a>
<span class="sourceLineNo">2061</span>         */<a name="line.2061"></a>
<span class="sourceLineNo">2062</span>        private static void difference(final Dataset a, final Dataset out) {<a name="line.2062"></a>
<span class="sourceLineNo">2063</span>                final int isize = a.getElementsPerItem();<a name="line.2063"></a>
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<span class="sourceLineNo">2068</span>                int oi = it.index;<a name="line.2068"></a>
<span class="sourceLineNo">2069</span><a name="line.2069"></a>
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<span class="sourceLineNo">2071</span>                case Dataset.INT8:<a name="line.2071"></a>
<span class="sourceLineNo">2072</span>                        final byte[] i8data = ((ByteDataset) a).data;<a name="line.2072"></a>
<span class="sourceLineNo">2073</span>                        final byte[] oi8data = ((ByteDataset) out).getData();<a name="line.2073"></a>
<span class="sourceLineNo">2074</span>                        for (int i = 0; it.hasNext();) {<a name="line.2074"></a>
<span class="sourceLineNo">2075</span>                                oi8data[i++] = (byte) (i8data[it.index] - i8data[oi]);<a name="line.2075"></a>
<span class="sourceLineNo">2076</span>                                oi = it.index;<a name="line.2076"></a>
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<span class="sourceLineNo">2079</span>                case Dataset.INT16:<a name="line.2079"></a>
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<span class="sourceLineNo">2081</span>                        final short[] oi16data = ((ShortDataset) out).getData();<a name="line.2081"></a>
<span class="sourceLineNo">2082</span>                        for (int i = 0; it.hasNext();) {<a name="line.2082"></a>
<span class="sourceLineNo">2083</span>                                oi16data[i++] = (short) (i16data[it.index] - i16data[oi]);<a name="line.2083"></a>
<span class="sourceLineNo">2084</span>                                oi = it.index;<a name="line.2084"></a>
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<span class="sourceLineNo">2087</span>                case Dataset.INT32:<a name="line.2087"></a>
<span class="sourceLineNo">2088</span>                        final int[] i32data = ((IntegerDataset) a).data;<a name="line.2088"></a>
<span class="sourceLineNo">2089</span>                        final int[] oi32data = ((IntegerDataset) out).getData();<a name="line.2089"></a>
<span class="sourceLineNo">2090</span>                        for (int i = 0; it.hasNext();) {<a name="line.2090"></a>
<span class="sourceLineNo">2091</span>                                oi32data[i++] = i32data[it.index] - i32data[oi];<a name="line.2091"></a>
<span class="sourceLineNo">2092</span>                                oi = it.index;<a name="line.2092"></a>
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<span class="sourceLineNo">2094</span>                        break;<a name="line.2094"></a>
<span class="sourceLineNo">2095</span>                case Dataset.INT64:<a name="line.2095"></a>
<span class="sourceLineNo">2096</span>                        final long[] i64data = ((LongDataset) a).data;<a name="line.2096"></a>
<span class="sourceLineNo">2097</span>                        final long[] oi64data = ((LongDataset) out).getData();<a name="line.2097"></a>
<span class="sourceLineNo">2098</span>                        for (int i = 0; it.hasNext();) {<a name="line.2098"></a>
<span class="sourceLineNo">2099</span>                                oi64data[i++] = i64data[it.index] - i64data[oi];<a name="line.2099"></a>
<span class="sourceLineNo">2100</span>                                oi = it.index;<a name="line.2100"></a>
<span class="sourceLineNo">2101</span>                        }<a name="line.2101"></a>
<span class="sourceLineNo">2102</span>                        break;<a name="line.2102"></a>
<span class="sourceLineNo">2103</span>                case Dataset.ARRAYINT8:<a name="line.2103"></a>
<span class="sourceLineNo">2104</span>                        final byte[] ai8data = ((CompoundByteDataset) a).data;<a name="line.2104"></a>
<span class="sourceLineNo">2105</span>                        final byte[] oai8data = ((CompoundByteDataset) out).getData();<a name="line.2105"></a>
<span class="sourceLineNo">2106</span>                        for (int i = 0; it.hasNext();) {<a name="line.2106"></a>
<span class="sourceLineNo">2107</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2107"></a>
<span class="sourceLineNo">2108</span>                                        oai8data[i++] = (byte) (ai8data[it.index + k] - ai8data[oi++]);<a name="line.2108"></a>
<span class="sourceLineNo">2109</span>                                }<a name="line.2109"></a>
<span class="sourceLineNo">2110</span>                                oi = it.index;<a name="line.2110"></a>
<span class="sourceLineNo">2111</span>                        }<a name="line.2111"></a>
<span class="sourceLineNo">2112</span>                        break;<a name="line.2112"></a>
<span class="sourceLineNo">2113</span>                case Dataset.ARRAYINT16:<a name="line.2113"></a>
<span class="sourceLineNo">2114</span>                        final short[] ai16data = ((CompoundShortDataset) a).data;<a name="line.2114"></a>
<span class="sourceLineNo">2115</span>                        final short[] oai16data = ((CompoundShortDataset) out).getData();<a name="line.2115"></a>
<span class="sourceLineNo">2116</span>                        for (int i = 0; it.hasNext();) {<a name="line.2116"></a>
<span class="sourceLineNo">2117</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2117"></a>
<span class="sourceLineNo">2118</span>                                        oai16data[i++] = (short) (ai16data[it.index + k] - ai16data[oi++]);<a name="line.2118"></a>
<span class="sourceLineNo">2119</span>                                }<a name="line.2119"></a>
<span class="sourceLineNo">2120</span>                                oi = it.index;<a name="line.2120"></a>
<span class="sourceLineNo">2121</span>                        }<a name="line.2121"></a>
<span class="sourceLineNo">2122</span>                        break;<a name="line.2122"></a>
<span class="sourceLineNo">2123</span>                case Dataset.ARRAYINT32:<a name="line.2123"></a>
<span class="sourceLineNo">2124</span>                        final int[] ai32data = ((CompoundIntegerDataset) a).data;<a name="line.2124"></a>
<span class="sourceLineNo">2125</span>                        final int[] oai32data = ((CompoundIntegerDataset) out).getData();<a name="line.2125"></a>
<span class="sourceLineNo">2126</span>                        for (int i = 0; it.hasNext();) {<a name="line.2126"></a>
<span class="sourceLineNo">2127</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2127"></a>
<span class="sourceLineNo">2128</span>                                        oai32data[i++] = ai32data[it.index + k] - ai32data[oi++];<a name="line.2128"></a>
<span class="sourceLineNo">2129</span>                                }<a name="line.2129"></a>
<span class="sourceLineNo">2130</span>                                oi = it.index;<a name="line.2130"></a>
<span class="sourceLineNo">2131</span>                        }<a name="line.2131"></a>
<span class="sourceLineNo">2132</span>                        break;<a name="line.2132"></a>
<span class="sourceLineNo">2133</span>                case Dataset.ARRAYINT64:<a name="line.2133"></a>
<span class="sourceLineNo">2134</span>                        final long[] ai64data = ((CompoundLongDataset) a).data;<a name="line.2134"></a>
<span class="sourceLineNo">2135</span>                        final long[] oai64data = ((CompoundLongDataset) out).getData();<a name="line.2135"></a>
<span class="sourceLineNo">2136</span>                        for (int i = 0; it.hasNext();) {<a name="line.2136"></a>
<span class="sourceLineNo">2137</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2137"></a>
<span class="sourceLineNo">2138</span>                                        oai64data[i++] = ai64data[it.index + k] - ai64data[oi++];<a name="line.2138"></a>
<span class="sourceLineNo">2139</span>                                }<a name="line.2139"></a>
<span class="sourceLineNo">2140</span>                                oi = it.index;<a name="line.2140"></a>
<span class="sourceLineNo">2141</span>                        }<a name="line.2141"></a>
<span class="sourceLineNo">2142</span>                        break;<a name="line.2142"></a>
<span class="sourceLineNo">2143</span>                case Dataset.FLOAT32:<a name="line.2143"></a>
<span class="sourceLineNo">2144</span>                        final float[] f32data = ((FloatDataset) a).data;<a name="line.2144"></a>
<span class="sourceLineNo">2145</span>                        final float[] of32data = ((FloatDataset) out).getData();<a name="line.2145"></a>
<span class="sourceLineNo">2146</span>                        for (int i = 0; it.hasNext();) {<a name="line.2146"></a>
<span class="sourceLineNo">2147</span>                                of32data[i++] = f32data[it.index] - f32data[oi];<a name="line.2147"></a>
<span class="sourceLineNo">2148</span>                                oi = it.index;<a name="line.2148"></a>
<span class="sourceLineNo">2149</span>                        }<a name="line.2149"></a>
<span class="sourceLineNo">2150</span>                        break;<a name="line.2150"></a>
<span class="sourceLineNo">2151</span>                case Dataset.FLOAT64:<a name="line.2151"></a>
<span class="sourceLineNo">2152</span>                        final double[] f64data = ((DoubleDataset) a).data;<a name="line.2152"></a>
<span class="sourceLineNo">2153</span>                        final double[] of64data = ((DoubleDataset) out).getData();<a name="line.2153"></a>
<span class="sourceLineNo">2154</span>                        for (int i = 0; it.hasNext();) {<a name="line.2154"></a>
<span class="sourceLineNo">2155</span>                                of64data[i++] = f64data[it.index] - f64data[oi];<a name="line.2155"></a>
<span class="sourceLineNo">2156</span>                                oi = it.index;<a name="line.2156"></a>
<span class="sourceLineNo">2157</span>                        }<a name="line.2157"></a>
<span class="sourceLineNo">2158</span>                        break;<a name="line.2158"></a>
<span class="sourceLineNo">2159</span>                case Dataset.COMPLEX64:<a name="line.2159"></a>
<span class="sourceLineNo">2160</span>                        final float[] c64data = ((ComplexFloatDataset) a).data;<a name="line.2160"></a>
<span class="sourceLineNo">2161</span>                        final float[] oc64data = ((ComplexFloatDataset) out).getData();<a name="line.2161"></a>
<span class="sourceLineNo">2162</span>                        for (int i = 0; it.hasNext();) {<a name="line.2162"></a>
<span class="sourceLineNo">2163</span>                                oc64data[i++] = c64data[it.index] - c64data[oi];<a name="line.2163"></a>
<span class="sourceLineNo">2164</span>                                oc64data[i++] = c64data[it.index + 1] - c64data[oi + 1];<a name="line.2164"></a>
<span class="sourceLineNo">2165</span>                                oi = it.index;<a name="line.2165"></a>
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<span class="sourceLineNo">2167</span>                        break;<a name="line.2167"></a>
<span class="sourceLineNo">2168</span>                case Dataset.COMPLEX128:<a name="line.2168"></a>
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<span class="sourceLineNo">2170</span>                        final double[] oc128data = ((ComplexDoubleDataset) out).getData();<a name="line.2170"></a>
<span class="sourceLineNo">2171</span>                        for (int i = 0; it.hasNext();) {<a name="line.2171"></a>
<span class="sourceLineNo">2172</span>                                oc128data[i++] = c128data[it.index] - c128data[oi];<a name="line.2172"></a>
<span class="sourceLineNo">2173</span>                                oc128data[i++] = c128data[it.index + 1] - c128data[oi + 1];<a name="line.2173"></a>
<span class="sourceLineNo">2174</span>                                oi = it.index;<a name="line.2174"></a>
<span class="sourceLineNo">2175</span>                        }<a name="line.2175"></a>
<span class="sourceLineNo">2176</span>                        break;<a name="line.2176"></a>
<span class="sourceLineNo">2177</span>                case Dataset.ARRAYFLOAT32:<a name="line.2177"></a>
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<span class="sourceLineNo">2179</span>                        final float[] oaf32data = ((CompoundFloatDataset) out).getData();<a name="line.2179"></a>
<span class="sourceLineNo">2180</span>                        for (int i = 0; it.hasNext();) {<a name="line.2180"></a>
<span class="sourceLineNo">2181</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2181"></a>
<span class="sourceLineNo">2182</span>                                        oaf32data[i++] = af32data[it.index + k] - af32data[oi++];<a name="line.2182"></a>
<span class="sourceLineNo">2183</span>                                }<a name="line.2183"></a>
<span class="sourceLineNo">2184</span>                                oi = it.index;<a name="line.2184"></a>
<span class="sourceLineNo">2185</span>                        }<a name="line.2185"></a>
<span class="sourceLineNo">2186</span>                        break;<a name="line.2186"></a>
<span class="sourceLineNo">2187</span>                case Dataset.ARRAYFLOAT64:<a name="line.2187"></a>
<span class="sourceLineNo">2188</span>                        final double[] af64data = ((CompoundDoubleDataset) a).data;<a name="line.2188"></a>
<span class="sourceLineNo">2189</span>                        final double[] oaf64data = ((CompoundDoubleDataset) out).getData();<a name="line.2189"></a>
<span class="sourceLineNo">2190</span>                        for (int i = 0; it.hasNext();) {<a name="line.2190"></a>
<span class="sourceLineNo">2191</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2191"></a>
<span class="sourceLineNo">2192</span>                                        oaf64data[i++] = af64data[it.index + k] - af64data[oi++];<a name="line.2192"></a>
<span class="sourceLineNo">2193</span>                                }<a name="line.2193"></a>
<span class="sourceLineNo">2194</span>                                oi = it.index;<a name="line.2194"></a>
<span class="sourceLineNo">2195</span>                        }<a name="line.2195"></a>
<span class="sourceLineNo">2196</span>                        break;<a name="line.2196"></a>
<span class="sourceLineNo">2197</span>                default:<a name="line.2197"></a>
<span class="sourceLineNo">2198</span>                        throw new UnsupportedOperationException("difference does not support this dataset type");<a name="line.2198"></a>
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<span class="sourceLineNo">2200</span>        }<a name="line.2200"></a>
<span class="sourceLineNo">2201</span><a name="line.2201"></a>
<span class="sourceLineNo">2202</span>        /**<a name="line.2202"></a>
<span class="sourceLineNo">2203</span>         * Get next set of indexes<a name="line.2203"></a>
<span class="sourceLineNo">2204</span>         * @param it<a name="line.2204"></a>
<span class="sourceLineNo">2205</span>         * @param indexes<a name="line.2205"></a>
<span class="sourceLineNo">2206</span>         * @return true if there is more<a name="line.2206"></a>
<span class="sourceLineNo">2207</span>         */<a name="line.2207"></a>
<span class="sourceLineNo">2208</span>        private static boolean nextIndexes(IndexIterator it, int[] indexes) {<a name="line.2208"></a>
<span class="sourceLineNo">2209</span>                if (!it.hasNext())<a name="line.2209"></a>
<span class="sourceLineNo">2210</span>                        return false;<a name="line.2210"></a>
<span class="sourceLineNo">2211</span>                int m = indexes.length;<a name="line.2211"></a>
<span class="sourceLineNo">2212</span>                int i = 0;<a name="line.2212"></a>
<span class="sourceLineNo">2213</span>                for (i = 0; i &lt; m - 1; i++) {<a name="line.2213"></a>
<span class="sourceLineNo">2214</span>                        indexes[i] = indexes[i+1];<a name="line.2214"></a>
<span class="sourceLineNo">2215</span>                }<a name="line.2215"></a>
<span class="sourceLineNo">2216</span>                indexes[i] = it.index;<a name="line.2216"></a>
<span class="sourceLineNo">2217</span>                return true;<a name="line.2217"></a>
<span class="sourceLineNo">2218</span>        }<a name="line.2218"></a>
<span class="sourceLineNo">2219</span><a name="line.2219"></a>
<span class="sourceLineNo">2220</span>        <a name="line.2220"></a>
<span class="sourceLineNo">2221</span>        /**<a name="line.2221"></a>
<span class="sourceLineNo">2222</span>         * General order discrete difference of dataset along flattened dataset using finite difference<a name="line.2222"></a>
<span class="sourceLineNo">2223</span>         * @param a is 1d dataset<a name="line.2223"></a>
<span class="sourceLineNo">2224</span>         * @param out is 1d dataset<a name="line.2224"></a>
<span class="sourceLineNo">2225</span>         * @param n order of difference<a name="line.2225"></a>
<span class="sourceLineNo">2226</span>         */<a name="line.2226"></a>
<span class="sourceLineNo">2227</span>        private static void difference(final Dataset a, final Dataset out, final int n) {<a name="line.2227"></a>
<span class="sourceLineNo">2228</span>                if (n == 1) {<a name="line.2228"></a>
<span class="sourceLineNo">2229</span>                        difference(a, out);<a name="line.2229"></a>
<span class="sourceLineNo">2230</span>                        return;<a name="line.2230"></a>
<span class="sourceLineNo">2231</span>                }<a name="line.2231"></a>
<span class="sourceLineNo">2232</span><a name="line.2232"></a>
<span class="sourceLineNo">2233</span>                final int isize = a.getElementsPerItem();<a name="line.2233"></a>
<span class="sourceLineNo">2234</span><a name="line.2234"></a>
<span class="sourceLineNo">2235</span>                final int[] coeff = bincoeff(n);<a name="line.2235"></a>
<span class="sourceLineNo">2236</span>                final int m = n + 1;<a name="line.2236"></a>
<span class="sourceLineNo">2237</span>                final int[] indexes = new int[m]; // store for index values<a name="line.2237"></a>
<span class="sourceLineNo">2238</span><a name="line.2238"></a>
<span class="sourceLineNo">2239</span>                final IndexIterator it = a.getIterator();<a name="line.2239"></a>
<span class="sourceLineNo">2240</span>                for (int i = 0; i &lt; n; i++) {<a name="line.2240"></a>
<span class="sourceLineNo">2241</span>                        indexes[i] = it.index;<a name="line.2241"></a>
<span class="sourceLineNo">2242</span>                        it.hasNext();<a name="line.2242"></a>
<span class="sourceLineNo">2243</span>                }<a name="line.2243"></a>
<span class="sourceLineNo">2244</span>                indexes[n] = it.index;<a name="line.2244"></a>
<span class="sourceLineNo">2245</span><a name="line.2245"></a>
<span class="sourceLineNo">2246</span>                switch (a.getDType()) {<a name="line.2246"></a>
<span class="sourceLineNo">2247</span>                case Dataset.INT8:<a name="line.2247"></a>
<span class="sourceLineNo">2248</span>                        final byte[] i8data = ((ByteDataset) a).data;<a name="line.2248"></a>
<span class="sourceLineNo">2249</span>                        final byte[] oi8data = ((ByteDataset) out).getData();<a name="line.2249"></a>
<span class="sourceLineNo">2250</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2250"></a>
<span class="sourceLineNo">2251</span>                                int ox = 0;<a name="line.2251"></a>
<span class="sourceLineNo">2252</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2252"></a>
<span class="sourceLineNo">2253</span>                                        ox += i8data[indexes[j]] * coeff[j];<a name="line.2253"></a>
<span class="sourceLineNo">2254</span>                                }<a name="line.2254"></a>
<span class="sourceLineNo">2255</span>                                oi8data[i++] = (byte) ox;<a name="line.2255"></a>
<span class="sourceLineNo">2256</span>                        }<a name="line.2256"></a>
<span class="sourceLineNo">2257</span>                        break;<a name="line.2257"></a>
<span class="sourceLineNo">2258</span>                case Dataset.INT16:<a name="line.2258"></a>
<span class="sourceLineNo">2259</span>                        final short[] i16data = ((ShortDataset) a).data;<a name="line.2259"></a>
<span class="sourceLineNo">2260</span>                        final short[] oi16data = ((ShortDataset) out).getData();<a name="line.2260"></a>
<span class="sourceLineNo">2261</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2261"></a>
<span class="sourceLineNo">2262</span>                                int ox = 0;<a name="line.2262"></a>
<span class="sourceLineNo">2263</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2263"></a>
<span class="sourceLineNo">2264</span>                                        ox += i16data[indexes[j]] * coeff[j];<a name="line.2264"></a>
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<span class="sourceLineNo">2266</span>                                oi16data[i++] = (short) ox;<a name="line.2266"></a>
<span class="sourceLineNo">2267</span>                        }<a name="line.2267"></a>
<span class="sourceLineNo">2268</span>                        break;<a name="line.2268"></a>
<span class="sourceLineNo">2269</span>                case Dataset.INT32:<a name="line.2269"></a>
<span class="sourceLineNo">2270</span>                        final int[] i32data = ((IntegerDataset) a).data;<a name="line.2270"></a>
<span class="sourceLineNo">2271</span>                        final int[] oi32data = ((IntegerDataset) out).getData();<a name="line.2271"></a>
<span class="sourceLineNo">2272</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2272"></a>
<span class="sourceLineNo">2273</span>                                int ox = 0;<a name="line.2273"></a>
<span class="sourceLineNo">2274</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2274"></a>
<span class="sourceLineNo">2275</span>                                        ox += i32data[indexes[j]] * coeff[j];<a name="line.2275"></a>
<span class="sourceLineNo">2276</span>                                }<a name="line.2276"></a>
<span class="sourceLineNo">2277</span>                                oi32data[i++] = ox;<a name="line.2277"></a>
<span class="sourceLineNo">2278</span>                        }<a name="line.2278"></a>
<span class="sourceLineNo">2279</span>                        break;<a name="line.2279"></a>
<span class="sourceLineNo">2280</span>                case Dataset.INT64:<a name="line.2280"></a>
<span class="sourceLineNo">2281</span>                        final long[] i64data = ((LongDataset) a).data;<a name="line.2281"></a>
<span class="sourceLineNo">2282</span>                        final long[] oi64data = ((LongDataset) out).getData();<a name="line.2282"></a>
<span class="sourceLineNo">2283</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2283"></a>
<span class="sourceLineNo">2284</span>                                long ox = 0;<a name="line.2284"></a>
<span class="sourceLineNo">2285</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2285"></a>
<span class="sourceLineNo">2286</span>                                        ox += i64data[indexes[j]] * coeff[j];<a name="line.2286"></a>
<span class="sourceLineNo">2287</span>                                }<a name="line.2287"></a>
<span class="sourceLineNo">2288</span>                                oi64data[i++] = ox;<a name="line.2288"></a>
<span class="sourceLineNo">2289</span>                        }<a name="line.2289"></a>
<span class="sourceLineNo">2290</span>                        break;<a name="line.2290"></a>
<span class="sourceLineNo">2291</span>                case Dataset.ARRAYINT8:<a name="line.2291"></a>
<span class="sourceLineNo">2292</span>                        final byte[] ai8data = ((CompoundByteDataset) a).data;<a name="line.2292"></a>
<span class="sourceLineNo">2293</span>                        final byte[] oai8data = ((CompoundByteDataset) out).getData();<a name="line.2293"></a>
<span class="sourceLineNo">2294</span>                        int[] box = new int[isize];<a name="line.2294"></a>
<span class="sourceLineNo">2295</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2295"></a>
<span class="sourceLineNo">2296</span>                                Arrays.fill(box, 0);<a name="line.2296"></a>
<span class="sourceLineNo">2297</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2297"></a>
<span class="sourceLineNo">2298</span>                                        double c = coeff[j];<a name="line.2298"></a>
<span class="sourceLineNo">2299</span>                                        int l = indexes[j];<a name="line.2299"></a>
<span class="sourceLineNo">2300</span>                                        for (int k = 0; k &lt; isize; k++) {<a name="line.2300"></a>
<span class="sourceLineNo">2301</span>                                                box[k] += ai8data[l++] * c;<a name="line.2301"></a>
<span class="sourceLineNo">2302</span>                                        }<a name="line.2302"></a>
<span class="sourceLineNo">2303</span>                                }<a name="line.2303"></a>
<span class="sourceLineNo">2304</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2304"></a>
<span class="sourceLineNo">2305</span>                                        oai8data[i++] = (byte) box[k];<a name="line.2305"></a>
<span class="sourceLineNo">2306</span>                                }<a name="line.2306"></a>
<span class="sourceLineNo">2307</span>                        }<a name="line.2307"></a>
<span class="sourceLineNo">2308</span>                        break;<a name="line.2308"></a>
<span class="sourceLineNo">2309</span>                case Dataset.ARRAYINT16:<a name="line.2309"></a>
<span class="sourceLineNo">2310</span>                        final short[] ai16data = ((CompoundShortDataset) a).data;<a name="line.2310"></a>
<span class="sourceLineNo">2311</span>                        final short[] oai16data = ((CompoundShortDataset) out).getData();<a name="line.2311"></a>
<span class="sourceLineNo">2312</span>                        int[] sox = new int[isize];<a name="line.2312"></a>
<span class="sourceLineNo">2313</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2313"></a>
<span class="sourceLineNo">2314</span>                                Arrays.fill(sox, 0);<a name="line.2314"></a>
<span class="sourceLineNo">2315</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2315"></a>
<span class="sourceLineNo">2316</span>                                        double c = coeff[j];<a name="line.2316"></a>
<span class="sourceLineNo">2317</span>                                        int l = indexes[j];<a name="line.2317"></a>
<span class="sourceLineNo">2318</span>                                        for (int k = 0; k &lt; isize; k++) {<a name="line.2318"></a>
<span class="sourceLineNo">2319</span>                                                sox[k] += ai16data[l++] * c;<a name="line.2319"></a>
<span class="sourceLineNo">2320</span>                                        }<a name="line.2320"></a>
<span class="sourceLineNo">2321</span>                                }<a name="line.2321"></a>
<span class="sourceLineNo">2322</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2322"></a>
<span class="sourceLineNo">2323</span>                                        oai16data[i++] = (short) sox[k];<a name="line.2323"></a>
<span class="sourceLineNo">2324</span>                                }<a name="line.2324"></a>
<span class="sourceLineNo">2325</span>                        }<a name="line.2325"></a>
<span class="sourceLineNo">2326</span>                        break;<a name="line.2326"></a>
<span class="sourceLineNo">2327</span>                case Dataset.ARRAYINT32:<a name="line.2327"></a>
<span class="sourceLineNo">2328</span>                        final int[] ai32data = ((CompoundIntegerDataset) a).data;<a name="line.2328"></a>
<span class="sourceLineNo">2329</span>                        final int[] oai32data = ((CompoundIntegerDataset) out).getData();<a name="line.2329"></a>
<span class="sourceLineNo">2330</span>                        int[] iox = new int[isize];<a name="line.2330"></a>
<span class="sourceLineNo">2331</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2331"></a>
<span class="sourceLineNo">2332</span>                                Arrays.fill(iox, 0);<a name="line.2332"></a>
<span class="sourceLineNo">2333</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2333"></a>
<span class="sourceLineNo">2334</span>                                        double c = coeff[j];<a name="line.2334"></a>
<span class="sourceLineNo">2335</span>                                        int l = indexes[j];<a name="line.2335"></a>
<span class="sourceLineNo">2336</span>                                        for (int k = 0; k &lt; isize; k++) {<a name="line.2336"></a>
<span class="sourceLineNo">2337</span>                                                iox[k] += ai32data[l++] * c;<a name="line.2337"></a>
<span class="sourceLineNo">2338</span>                                        }<a name="line.2338"></a>
<span class="sourceLineNo">2339</span>                                }<a name="line.2339"></a>
<span class="sourceLineNo">2340</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2340"></a>
<span class="sourceLineNo">2341</span>                                        oai32data[i++] = iox[k];<a name="line.2341"></a>
<span class="sourceLineNo">2342</span>                                }<a name="line.2342"></a>
<span class="sourceLineNo">2343</span>                        }<a name="line.2343"></a>
<span class="sourceLineNo">2344</span>                        break;<a name="line.2344"></a>
<span class="sourceLineNo">2345</span>                case Dataset.ARRAYINT64:<a name="line.2345"></a>
<span class="sourceLineNo">2346</span>                        final long[] ai64data = ((CompoundLongDataset) a).data;<a name="line.2346"></a>
<span class="sourceLineNo">2347</span>                        final long[] oai64data = ((CompoundLongDataset) out).getData();<a name="line.2347"></a>
<span class="sourceLineNo">2348</span>                        long[] lox = new long[isize];<a name="line.2348"></a>
<span class="sourceLineNo">2349</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2349"></a>
<span class="sourceLineNo">2350</span>                                Arrays.fill(lox, 0);<a name="line.2350"></a>
<span class="sourceLineNo">2351</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2351"></a>
<span class="sourceLineNo">2352</span>                                        double c = coeff[j];<a name="line.2352"></a>
<span class="sourceLineNo">2353</span>                                        int l = indexes[j];<a name="line.2353"></a>
<span class="sourceLineNo">2354</span>                                        for (int k = 0; k &lt; isize; k++) {<a name="line.2354"></a>
<span class="sourceLineNo">2355</span>                                                lox[k] += ai64data[l++] * c;<a name="line.2355"></a>
<span class="sourceLineNo">2356</span>                                        }<a name="line.2356"></a>
<span class="sourceLineNo">2357</span>                                }<a name="line.2357"></a>
<span class="sourceLineNo">2358</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2358"></a>
<span class="sourceLineNo">2359</span>                                        oai64data[i++] = lox[k];<a name="line.2359"></a>
<span class="sourceLineNo">2360</span>                                }<a name="line.2360"></a>
<span class="sourceLineNo">2361</span>                        }<a name="line.2361"></a>
<span class="sourceLineNo">2362</span>                        break;<a name="line.2362"></a>
<span class="sourceLineNo">2363</span>                case Dataset.FLOAT32:<a name="line.2363"></a>
<span class="sourceLineNo">2364</span>                        final float[] f32data = ((FloatDataset) a).data;<a name="line.2364"></a>
<span class="sourceLineNo">2365</span>                        final float[] of32data = ((FloatDataset) out).getData();<a name="line.2365"></a>
<span class="sourceLineNo">2366</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2366"></a>
<span class="sourceLineNo">2367</span>                                float ox = 0;<a name="line.2367"></a>
<span class="sourceLineNo">2368</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2368"></a>
<span class="sourceLineNo">2369</span>                                        ox += f32data[indexes[j]] * coeff[j];<a name="line.2369"></a>
<span class="sourceLineNo">2370</span>                                }<a name="line.2370"></a>
<span class="sourceLineNo">2371</span>                                of32data[i++] = ox;<a name="line.2371"></a>
<span class="sourceLineNo">2372</span>                        }<a name="line.2372"></a>
<span class="sourceLineNo">2373</span>                        break;<a name="line.2373"></a>
<span class="sourceLineNo">2374</span>                case Dataset.FLOAT64:<a name="line.2374"></a>
<span class="sourceLineNo">2375</span>                        final double[] f64data = ((DoubleDataset) a).data;<a name="line.2375"></a>
<span class="sourceLineNo">2376</span>                        final double[] of64data = ((DoubleDataset) out).getData();<a name="line.2376"></a>
<span class="sourceLineNo">2377</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2377"></a>
<span class="sourceLineNo">2378</span>                                double ox = 0;<a name="line.2378"></a>
<span class="sourceLineNo">2379</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2379"></a>
<span class="sourceLineNo">2380</span>                                        ox += f64data[indexes[j]] * coeff[j];<a name="line.2380"></a>
<span class="sourceLineNo">2381</span>                                }<a name="line.2381"></a>
<span class="sourceLineNo">2382</span>                                of64data[i++] = ox;<a name="line.2382"></a>
<span class="sourceLineNo">2383</span>                        }<a name="line.2383"></a>
<span class="sourceLineNo">2384</span>                        break;<a name="line.2384"></a>
<span class="sourceLineNo">2385</span>                case Dataset.COMPLEX64:<a name="line.2385"></a>
<span class="sourceLineNo">2386</span>                        final float[] c64data = ((ComplexFloatDataset) a).data;<a name="line.2386"></a>
<span class="sourceLineNo">2387</span>                        final float[] oc64data = ((ComplexFloatDataset) out).getData();<a name="line.2387"></a>
<span class="sourceLineNo">2388</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2388"></a>
<span class="sourceLineNo">2389</span>                                float ox = 0;<a name="line.2389"></a>
<span class="sourceLineNo">2390</span>                                float oy = 0;<a name="line.2390"></a>
<span class="sourceLineNo">2391</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2391"></a>
<span class="sourceLineNo">2392</span>                                        int l = indexes[j];<a name="line.2392"></a>
<span class="sourceLineNo">2393</span>                                        ox += c64data[l++] * coeff[j];<a name="line.2393"></a>
<span class="sourceLineNo">2394</span>                                        oy += c64data[l] * coeff[j];<a name="line.2394"></a>
<span class="sourceLineNo">2395</span>                                }<a name="line.2395"></a>
<span class="sourceLineNo">2396</span>                                oc64data[i++] = ox;<a name="line.2396"></a>
<span class="sourceLineNo">2397</span>                                oc64data[i++] = oy;<a name="line.2397"></a>
<span class="sourceLineNo">2398</span>                        }<a name="line.2398"></a>
<span class="sourceLineNo">2399</span>                        break;<a name="line.2399"></a>
<span class="sourceLineNo">2400</span>                case Dataset.COMPLEX128:<a name="line.2400"></a>
<span class="sourceLineNo">2401</span>                        final double[] c128data = ((ComplexDoubleDataset) a).data;<a name="line.2401"></a>
<span class="sourceLineNo">2402</span>                        final double[] oc128data = ((ComplexDoubleDataset) out).getData();<a name="line.2402"></a>
<span class="sourceLineNo">2403</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2403"></a>
<span class="sourceLineNo">2404</span>                                double ox = 0;<a name="line.2404"></a>
<span class="sourceLineNo">2405</span>                                double oy = 0;<a name="line.2405"></a>
<span class="sourceLineNo">2406</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2406"></a>
<span class="sourceLineNo">2407</span>                                        int l = indexes[j];<a name="line.2407"></a>
<span class="sourceLineNo">2408</span>                                        ox += c128data[l++] * coeff[j];<a name="line.2408"></a>
<span class="sourceLineNo">2409</span>                                        oy += c128data[l] * coeff[j];<a name="line.2409"></a>
<span class="sourceLineNo">2410</span>                                }<a name="line.2410"></a>
<span class="sourceLineNo">2411</span>                                oc128data[i++] = ox;<a name="line.2411"></a>
<span class="sourceLineNo">2412</span>                                oc128data[i++] = oy;<a name="line.2412"></a>
<span class="sourceLineNo">2413</span>                        }<a name="line.2413"></a>
<span class="sourceLineNo">2414</span>                        break;<a name="line.2414"></a>
<span class="sourceLineNo">2415</span>                case Dataset.ARRAYFLOAT32:<a name="line.2415"></a>
<span class="sourceLineNo">2416</span>                        final float[] af32data = ((CompoundFloatDataset) a).data;<a name="line.2416"></a>
<span class="sourceLineNo">2417</span>                        final float[] oaf32data = ((CompoundFloatDataset) out).getData();<a name="line.2417"></a>
<span class="sourceLineNo">2418</span>                        float[] fox = new float[isize];<a name="line.2418"></a>
<span class="sourceLineNo">2419</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2419"></a>
<span class="sourceLineNo">2420</span>                                Arrays.fill(fox, 0);<a name="line.2420"></a>
<span class="sourceLineNo">2421</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2421"></a>
<span class="sourceLineNo">2422</span>                                        double c = coeff[j];<a name="line.2422"></a>
<span class="sourceLineNo">2423</span>                                        int l = indexes[j];<a name="line.2423"></a>
<span class="sourceLineNo">2424</span>                                        for (int k = 0; k &lt; isize; k++) {<a name="line.2424"></a>
<span class="sourceLineNo">2425</span>                                                fox[k] += af32data[l++] * c;<a name="line.2425"></a>
<span class="sourceLineNo">2426</span>                                        }<a name="line.2426"></a>
<span class="sourceLineNo">2427</span>                                }<a name="line.2427"></a>
<span class="sourceLineNo">2428</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2428"></a>
<span class="sourceLineNo">2429</span>                                        oaf32data[i++] = fox[k];<a name="line.2429"></a>
<span class="sourceLineNo">2430</span>                                }<a name="line.2430"></a>
<span class="sourceLineNo">2431</span>                        }<a name="line.2431"></a>
<span class="sourceLineNo">2432</span>                        break;<a name="line.2432"></a>
<span class="sourceLineNo">2433</span>                case Dataset.ARRAYFLOAT64:<a name="line.2433"></a>
<span class="sourceLineNo">2434</span>                        final double[] af64data = ((CompoundDoubleDataset) a).data;<a name="line.2434"></a>
<span class="sourceLineNo">2435</span>                        final double[] oaf64data = ((CompoundDoubleDataset) out).getData();<a name="line.2435"></a>
<span class="sourceLineNo">2436</span>                        double[] dox = new double[isize];<a name="line.2436"></a>
<span class="sourceLineNo">2437</span>                        for (int i = 0; nextIndexes(it, indexes);) {<a name="line.2437"></a>
<span class="sourceLineNo">2438</span>                                Arrays.fill(dox, 0);<a name="line.2438"></a>
<span class="sourceLineNo">2439</span>                                for (int j = 0; j &lt; m; j++) {<a name="line.2439"></a>
<span class="sourceLineNo">2440</span>                                        double c = coeff[j];<a name="line.2440"></a>
<span class="sourceLineNo">2441</span>                                        int l = indexes[j];<a name="line.2441"></a>
<span class="sourceLineNo">2442</span>                                        for (int k = 0; k &lt; isize; k++) {<a name="line.2442"></a>
<span class="sourceLineNo">2443</span>                                                dox[k] += af64data[l++] * c;<a name="line.2443"></a>
<span class="sourceLineNo">2444</span>                                        }<a name="line.2444"></a>
<span class="sourceLineNo">2445</span>                                }<a name="line.2445"></a>
<span class="sourceLineNo">2446</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2446"></a>
<span class="sourceLineNo">2447</span>                                        oaf64data[i++] = dox[k];<a name="line.2447"></a>
<span class="sourceLineNo">2448</span>                                }<a name="line.2448"></a>
<span class="sourceLineNo">2449</span>                        }<a name="line.2449"></a>
<span class="sourceLineNo">2450</span>                        break;<a name="line.2450"></a>
<span class="sourceLineNo">2451</span>                default:<a name="line.2451"></a>
<span class="sourceLineNo">2452</span>                        throw new UnsupportedOperationException("difference does not support multiple-element dataset");<a name="line.2452"></a>
<span class="sourceLineNo">2453</span>                }<a name="line.2453"></a>
<span class="sourceLineNo">2454</span>        }<a name="line.2454"></a>
<span class="sourceLineNo">2455</span><a name="line.2455"></a>
<span class="sourceLineNo">2456</span>        /**<a name="line.2456"></a>
<span class="sourceLineNo">2457</span>         * Discrete difference of dataset along axis using finite difference<a name="line.2457"></a>
<span class="sourceLineNo">2458</span>         * @param a<a name="line.2458"></a>
<span class="sourceLineNo">2459</span>         * @param n order of difference<a name="line.2459"></a>
<span class="sourceLineNo">2460</span>         * @param axis<a name="line.2460"></a>
<span class="sourceLineNo">2461</span>         * @return difference<a name="line.2461"></a>
<span class="sourceLineNo">2462</span>         */<a name="line.2462"></a>
<span class="sourceLineNo">2463</span>        @SuppressWarnings("deprecation")<a name="line.2463"></a>
<span class="sourceLineNo">2464</span>        public static Dataset difference(Dataset a, final int n, int axis) {<a name="line.2464"></a>
<span class="sourceLineNo">2465</span>                Dataset ds;<a name="line.2465"></a>
<span class="sourceLineNo">2466</span>                final int dt = a.getDType();<a name="line.2466"></a>
<span class="sourceLineNo">2467</span>                final int rank = a.getRank();<a name="line.2467"></a>
<span class="sourceLineNo">2468</span>                final int is = a.getElementsPerItem();<a name="line.2468"></a>
<span class="sourceLineNo">2469</span><a name="line.2469"></a>
<span class="sourceLineNo">2470</span>                if (axis &lt; 0) {<a name="line.2470"></a>
<span class="sourceLineNo">2471</span>                        axis += rank;<a name="line.2471"></a>
<span class="sourceLineNo">2472</span>                }<a name="line.2472"></a>
<span class="sourceLineNo">2473</span>                if (axis &lt; 0 || axis &gt;= rank) {<a name="line.2473"></a>
<span class="sourceLineNo">2474</span>                        throw new IllegalArgumentException("Axis is out of range");<a name="line.2474"></a>
<span class="sourceLineNo">2475</span>                }<a name="line.2475"></a>
<span class="sourceLineNo">2476</span>                <a name="line.2476"></a>
<span class="sourceLineNo">2477</span>                int[] nshape = a.getShape();<a name="line.2477"></a>
<span class="sourceLineNo">2478</span>                if (nshape[axis] &lt;= n) {<a name="line.2478"></a>
<span class="sourceLineNo">2479</span>                        nshape[axis] = 0;<a name="line.2479"></a>
<span class="sourceLineNo">2480</span>                        return DatasetFactory.zeros(is, nshape, dt);<a name="line.2480"></a>
<span class="sourceLineNo">2481</span>                }<a name="line.2481"></a>
<span class="sourceLineNo">2482</span><a name="line.2482"></a>
<span class="sourceLineNo">2483</span>                nshape[axis] -= n;<a name="line.2483"></a>
<span class="sourceLineNo">2484</span>                ds = DatasetFactory.zeros(is, nshape, dt);<a name="line.2484"></a>
<span class="sourceLineNo">2485</span>                if (rank == 1) {<a name="line.2485"></a>
<span class="sourceLineNo">2486</span>                        difference(DatasetUtils.convertToDataset(a), ds, n);<a name="line.2486"></a>
<span class="sourceLineNo">2487</span>                } else {<a name="line.2487"></a>
<span class="sourceLineNo">2488</span>                        final Dataset src = DatasetFactory.zeros(is, new int[] { a.getShapeRef()[axis] }, dt);<a name="line.2488"></a>
<span class="sourceLineNo">2489</span>                        final Dataset dest = DatasetFactory.zeros(is, new int[] { nshape[axis] }, dt);<a name="line.2489"></a>
<span class="sourceLineNo">2490</span>                        final PositionIterator pi = a.getPositionIterator(axis);<a name="line.2490"></a>
<span class="sourceLineNo">2491</span>                        final int[] pos = pi.getPos();<a name="line.2491"></a>
<span class="sourceLineNo">2492</span>                        final boolean[] hit = pi.getOmit();<a name="line.2492"></a>
<span class="sourceLineNo">2493</span>                        while (pi.hasNext()) {<a name="line.2493"></a>
<span class="sourceLineNo">2494</span>                                a.copyItemsFromAxes(pos, hit, src);<a name="line.2494"></a>
<span class="sourceLineNo">2495</span>                                difference(src, dest, n);<a name="line.2495"></a>
<span class="sourceLineNo">2496</span>                                ds.setItemsOnAxes(pos, hit, dest.getBuffer());<a name="line.2496"></a>
<span class="sourceLineNo">2497</span>                        }<a name="line.2497"></a>
<span class="sourceLineNo">2498</span>                }<a name="line.2498"></a>
<span class="sourceLineNo">2499</span><a name="line.2499"></a>
<span class="sourceLineNo">2500</span>                return ds;<a name="line.2500"></a>
<span class="sourceLineNo">2501</span>        }<a name="line.2501"></a>
<span class="sourceLineNo">2502</span><a name="line.2502"></a>
<span class="sourceLineNo">2503</span>        private static double SelectedMean(Dataset data, int Min, int Max) {<a name="line.2503"></a>
<span class="sourceLineNo">2504</span><a name="line.2504"></a>
<span class="sourceLineNo">2505</span>                double result = 0.0;<a name="line.2505"></a>
<span class="sourceLineNo">2506</span>                for (int i = Min, imax = data.getSize(); i &lt;= Max; i++) {<a name="line.2506"></a>
<span class="sourceLineNo">2507</span>                        // clip i appropriately, imagine that effectively the two ends continue<a name="line.2507"></a>
<span class="sourceLineNo">2508</span>                        // straight out.<a name="line.2508"></a>
<span class="sourceLineNo">2509</span>                        int pos = i;<a name="line.2509"></a>
<span class="sourceLineNo">2510</span>                        if (pos &lt; 0) {<a name="line.2510"></a>
<span class="sourceLineNo">2511</span>                                pos = 0;<a name="line.2511"></a>
<span class="sourceLineNo">2512</span>                        } else if (pos &gt;= imax) {<a name="line.2512"></a>
<span class="sourceLineNo">2513</span>                                pos = imax - 1;<a name="line.2513"></a>
<span class="sourceLineNo">2514</span>                        }<a name="line.2514"></a>
<span class="sourceLineNo">2515</span>                        result += data.getElementDoubleAbs(pos);<a name="line.2515"></a>
<span class="sourceLineNo">2516</span>                }<a name="line.2516"></a>
<span class="sourceLineNo">2517</span><a name="line.2517"></a>
<span class="sourceLineNo">2518</span>                // now the sum is complete, average the values.<a name="line.2518"></a>
<span class="sourceLineNo">2519</span>                result /= (Max - Min) + 1;<a name="line.2519"></a>
<span class="sourceLineNo">2520</span>                return result;<a name="line.2520"></a>
<span class="sourceLineNo">2521</span>        }<a name="line.2521"></a>
<span class="sourceLineNo">2522</span><a name="line.2522"></a>
<span class="sourceLineNo">2523</span>        private static void SelectedMeanArray(double[] out, Dataset data, int Min, int Max) {<a name="line.2523"></a>
<span class="sourceLineNo">2524</span>                final int isize = out.length;<a name="line.2524"></a>
<span class="sourceLineNo">2525</span>                for (int j = 0; j &lt; isize; j++)<a name="line.2525"></a>
<span class="sourceLineNo">2526</span>                        out[j] = 0.;<a name="line.2526"></a>
<span class="sourceLineNo">2527</span><a name="line.2527"></a>
<span class="sourceLineNo">2528</span>                for (int i = Min, imax = data.getSize(); i &lt;= Max; i++) {<a name="line.2528"></a>
<span class="sourceLineNo">2529</span>                        // clip i appropriately, imagine that effectively the two ends continue<a name="line.2529"></a>
<span class="sourceLineNo">2530</span>                        // straight out.<a name="line.2530"></a>
<span class="sourceLineNo">2531</span>                        int pos = i*isize;<a name="line.2531"></a>
<span class="sourceLineNo">2532</span>                        if (pos &lt; 0) {<a name="line.2532"></a>
<span class="sourceLineNo">2533</span>                                pos = 0;<a name="line.2533"></a>
<span class="sourceLineNo">2534</span>                        } else if (pos &gt;= imax) {<a name="line.2534"></a>
<span class="sourceLineNo">2535</span>                                pos = imax - isize;<a name="line.2535"></a>
<span class="sourceLineNo">2536</span>                        }<a name="line.2536"></a>
<span class="sourceLineNo">2537</span>                        for (int j = 0; j &lt; isize; j++)<a name="line.2537"></a>
<span class="sourceLineNo">2538</span>                                out[j] += data.getElementDoubleAbs(pos+j);<a name="line.2538"></a>
<span class="sourceLineNo">2539</span>                }<a name="line.2539"></a>
<span class="sourceLineNo">2540</span><a name="line.2540"></a>
<span class="sourceLineNo">2541</span>                // now the sum is complete, average the values.<a name="line.2541"></a>
<span class="sourceLineNo">2542</span>                double norm = 1./ (Max - Min + 1.);<a name="line.2542"></a>
<span class="sourceLineNo">2543</span>                for (int j = 0; j &lt; isize; j++)<a name="line.2543"></a>
<span class="sourceLineNo">2544</span>                        out[j] *= norm;<a name="line.2544"></a>
<span class="sourceLineNo">2545</span><a name="line.2545"></a>
<span class="sourceLineNo">2546</span>        }<a name="line.2546"></a>
<span class="sourceLineNo">2547</span><a name="line.2547"></a>
<span class="sourceLineNo">2548</span>        /**<a name="line.2548"></a>
<span class="sourceLineNo">2549</span>         * Calculates the derivative of a line described by two datasets (x,y) given a spread of n either<a name="line.2549"></a>
<span class="sourceLineNo">2550</span>         * side of the point<a name="line.2550"></a>
<span class="sourceLineNo">2551</span>         * <a name="line.2551"></a>
<span class="sourceLineNo">2552</span>         * @param x<a name="line.2552"></a>
<span class="sourceLineNo">2553</span>         *            The x values of the function to take the derivative of.<a name="line.2553"></a>
<span class="sourceLineNo">2554</span>         * @param y<a name="line.2554"></a>
<span class="sourceLineNo">2555</span>         *            The y values of the function to take the derivative of.<a name="line.2555"></a>
<span class="sourceLineNo">2556</span>         * @param n<a name="line.2556"></a>
<span class="sourceLineNo">2557</span>         *            The spread the derivative is calculated from, i.e. the<a name="line.2557"></a>
<span class="sourceLineNo">2558</span>         *            smoothing, the higher the value, the more smoothing occurs.<a name="line.2558"></a>
<span class="sourceLineNo">2559</span>         * @return A dataset which contains all the derivative point for point.<a name="line.2559"></a>
<span class="sourceLineNo">2560</span>         */<a name="line.2560"></a>
<span class="sourceLineNo">2561</span>        @SuppressWarnings("deprecation")<a name="line.2561"></a>
<span class="sourceLineNo">2562</span>        public static Dataset derivative(Dataset x, Dataset y, int n) {<a name="line.2562"></a>
<span class="sourceLineNo">2563</span>                if (x.getRank() != 1 || y.getRank() != 1) {<a name="line.2563"></a>
<span class="sourceLineNo">2564</span>                        throw new IllegalArgumentException("Only one dimensional dataset supported");<a name="line.2564"></a>
<span class="sourceLineNo">2565</span>                }<a name="line.2565"></a>
<span class="sourceLineNo">2566</span>                if (y.getSize() &gt; x.getSize()) {<a name="line.2566"></a>
<span class="sourceLineNo">2567</span>                        throw new IllegalArgumentException("Length of x dataset should be greater than or equal to y's");<a name="line.2567"></a>
<span class="sourceLineNo">2568</span>                }<a name="line.2568"></a>
<span class="sourceLineNo">2569</span>                int dtype = y.getDType();<a name="line.2569"></a>
<span class="sourceLineNo">2570</span>                Dataset result;<a name="line.2570"></a>
<span class="sourceLineNo">2571</span>                switch (dtype) {<a name="line.2571"></a>
<span class="sourceLineNo">2572</span>                case Dataset.BOOL:<a name="line.2572"></a>
<span class="sourceLineNo">2573</span>                case Dataset.INT8:<a name="line.2573"></a>
<span class="sourceLineNo">2574</span>                case Dataset.INT16:<a name="line.2574"></a>
<span class="sourceLineNo">2575</span>                case Dataset.ARRAYINT8:<a name="line.2575"></a>
<span class="sourceLineNo">2576</span>                case Dataset.ARRAYINT16:<a name="line.2576"></a>
<span class="sourceLineNo">2577</span>                        result = DatasetFactory.zeros(y, Dataset.FLOAT32);<a name="line.2577"></a>
<span class="sourceLineNo">2578</span>                        break;<a name="line.2578"></a>
<span class="sourceLineNo">2579</span>                case Dataset.INT32:<a name="line.2579"></a>
<span class="sourceLineNo">2580</span>                case Dataset.INT64:<a name="line.2580"></a>
<span class="sourceLineNo">2581</span>                case Dataset.ARRAYINT32:<a name="line.2581"></a>
<span class="sourceLineNo">2582</span>                case Dataset.ARRAYINT64:<a name="line.2582"></a>
<span class="sourceLineNo">2583</span>                        result = DatasetFactory.zeros(y, Dataset.FLOAT64);<a name="line.2583"></a>
<span class="sourceLineNo">2584</span>                        break;<a name="line.2584"></a>
<span class="sourceLineNo">2585</span>                case Dataset.FLOAT32:<a name="line.2585"></a>
<span class="sourceLineNo">2586</span>                case Dataset.FLOAT64:<a name="line.2586"></a>
<span class="sourceLineNo">2587</span>                case Dataset.COMPLEX64:<a name="line.2587"></a>
<span class="sourceLineNo">2588</span>                case Dataset.COMPLEX128:<a name="line.2588"></a>
<span class="sourceLineNo">2589</span>                case Dataset.ARRAYFLOAT32:<a name="line.2589"></a>
<span class="sourceLineNo">2590</span>                case Dataset.ARRAYFLOAT64:<a name="line.2590"></a>
<span class="sourceLineNo">2591</span>                        result = DatasetFactory.zeros(y);<a name="line.2591"></a>
<span class="sourceLineNo">2592</span>                        break;<a name="line.2592"></a>
<span class="sourceLineNo">2593</span>                default:<a name="line.2593"></a>
<span class="sourceLineNo">2594</span>                        throw new UnsupportedOperationException("derivative does not support multiple-element dataset");<a name="line.2594"></a>
<span class="sourceLineNo">2595</span>                }<a name="line.2595"></a>
<span class="sourceLineNo">2596</span><a name="line.2596"></a>
<span class="sourceLineNo">2597</span>                final int isize = y.getElementsPerItem();<a name="line.2597"></a>
<span class="sourceLineNo">2598</span>                if (isize == 1) {<a name="line.2598"></a>
<span class="sourceLineNo">2599</span>                        for (int i = 0, imax = x.getSize(); i &lt; imax; i++) {<a name="line.2599"></a>
<span class="sourceLineNo">2600</span>                                double LeftValue = SelectedMean(y, i - n, i - 1);<a name="line.2600"></a>
<span class="sourceLineNo">2601</span>                                double RightValue = SelectedMean(y, i + 1, i + n);<a name="line.2601"></a>
<span class="sourceLineNo">2602</span>                                double LeftPosition = SelectedMean(x, i - n, i - 1);<a name="line.2602"></a>
<span class="sourceLineNo">2603</span>                                double RightPosition = SelectedMean(x, i + 1, i + n);<a name="line.2603"></a>
<span class="sourceLineNo">2604</span><a name="line.2604"></a>
<span class="sourceLineNo">2605</span>                                // now the values and positions are calculated, the derivative can be<a name="line.2605"></a>
<span class="sourceLineNo">2606</span>                                // calculated.<a name="line.2606"></a>
<span class="sourceLineNo">2607</span>                                result.set(((RightValue - LeftValue) / (RightPosition - LeftPosition)), i);<a name="line.2607"></a>
<span class="sourceLineNo">2608</span>                        }<a name="line.2608"></a>
<span class="sourceLineNo">2609</span>                } else {<a name="line.2609"></a>
<span class="sourceLineNo">2610</span>                        double[] leftValues = new double[isize];<a name="line.2610"></a>
<span class="sourceLineNo">2611</span>                        double[] rightValues = new double[isize];<a name="line.2611"></a>
<span class="sourceLineNo">2612</span>                        for (int i = 0, imax = x.getSize(); i &lt; imax; i++) {<a name="line.2612"></a>
<span class="sourceLineNo">2613</span>                                SelectedMeanArray(leftValues, y, i - n, i - 1);<a name="line.2613"></a>
<span class="sourceLineNo">2614</span>                                SelectedMeanArray(rightValues, y, i + 1, i + n);<a name="line.2614"></a>
<span class="sourceLineNo">2615</span>                                double delta = SelectedMean(x, i - n, i - 1);<a name="line.2615"></a>
<span class="sourceLineNo">2616</span>                                delta = 1./(SelectedMean(x, i + 1, i + n) - delta);<a name="line.2616"></a>
<span class="sourceLineNo">2617</span>                                for (int j = 0; j &lt; isize; j++) {<a name="line.2617"></a>
<span class="sourceLineNo">2618</span>                                        rightValues[j] -= leftValues[j];<a name="line.2618"></a>
<span class="sourceLineNo">2619</span>                                        rightValues[j] *= delta;<a name="line.2619"></a>
<span class="sourceLineNo">2620</span>                                }<a name="line.2620"></a>
<span class="sourceLineNo">2621</span>                                result.set(rightValues, i);<a name="line.2621"></a>
<span class="sourceLineNo">2622</span>                        }<a name="line.2622"></a>
<span class="sourceLineNo">2623</span>                }<a name="line.2623"></a>
<span class="sourceLineNo">2624</span><a name="line.2624"></a>
<span class="sourceLineNo">2625</span>                // set the name based on the changes made<a name="line.2625"></a>
<span class="sourceLineNo">2626</span>                result.setName(y.getName() + "'");<a name="line.2626"></a>
<span class="sourceLineNo">2627</span><a name="line.2627"></a>
<span class="sourceLineNo">2628</span>                return result;<a name="line.2628"></a>
<span class="sourceLineNo">2629</span>        }<a name="line.2629"></a>
<span class="sourceLineNo">2630</span><a name="line.2630"></a>
<span class="sourceLineNo">2631</span>        /**<a name="line.2631"></a>
<span class="sourceLineNo">2632</span>         * Discrete difference of dataset along axis using finite central difference<a name="line.2632"></a>
<span class="sourceLineNo">2633</span>         * @param a<a name="line.2633"></a>
<span class="sourceLineNo">2634</span>         * @param axis<a name="line.2634"></a>
<span class="sourceLineNo">2635</span>         * @return difference<a name="line.2635"></a>
<span class="sourceLineNo">2636</span>         */<a name="line.2636"></a>
<span class="sourceLineNo">2637</span>        @SuppressWarnings("deprecation")<a name="line.2637"></a>
<span class="sourceLineNo">2638</span>        public static Dataset centralDifference(Dataset a, int axis) {<a name="line.2638"></a>
<span class="sourceLineNo">2639</span>                Dataset ds;<a name="line.2639"></a>
<span class="sourceLineNo">2640</span>                final int dt = a.getDType();<a name="line.2640"></a>
<span class="sourceLineNo">2641</span>                final int rank = a.getRank();<a name="line.2641"></a>
<span class="sourceLineNo">2642</span>                final int is = a.getElementsPerItem();<a name="line.2642"></a>
<span class="sourceLineNo">2643</span><a name="line.2643"></a>
<span class="sourceLineNo">2644</span>                if (axis &lt; 0) {<a name="line.2644"></a>
<span class="sourceLineNo">2645</span>                        axis += rank;<a name="line.2645"></a>
<span class="sourceLineNo">2646</span>                }<a name="line.2646"></a>
<span class="sourceLineNo">2647</span>                if (axis &lt; 0 || axis &gt;= rank) {<a name="line.2647"></a>
<span class="sourceLineNo">2648</span>                        throw new IllegalArgumentException("Axis is out of range");<a name="line.2648"></a>
<span class="sourceLineNo">2649</span>                }<a name="line.2649"></a>
<span class="sourceLineNo">2650</span><a name="line.2650"></a>
<span class="sourceLineNo">2651</span>                final int len = a.getShapeRef()[axis];<a name="line.2651"></a>
<span class="sourceLineNo">2652</span>                if (len &lt; 2) {<a name="line.2652"></a>
<span class="sourceLineNo">2653</span>                        throw new IllegalArgumentException("Dataset should have a size &gt; 1 along given axis");<a name="line.2653"></a>
<span class="sourceLineNo">2654</span>                }<a name="line.2654"></a>
<span class="sourceLineNo">2655</span>                ds = DatasetFactory.zeros(is, a.getShapeRef(), dt);<a name="line.2655"></a>
<span class="sourceLineNo">2656</span>                if (rank == 1) {<a name="line.2656"></a>
<span class="sourceLineNo">2657</span>                        centralDifference(a, ds);<a name="line.2657"></a>
<span class="sourceLineNo">2658</span>                } else {<a name="line.2658"></a>
<span class="sourceLineNo">2659</span>                        final Dataset src = DatasetFactory.zeros(is, new int[] { len }, dt);<a name="line.2659"></a>
<span class="sourceLineNo">2660</span>                        final Dataset dest = DatasetFactory.zeros(is, new int[] { len }, dt);<a name="line.2660"></a>
<span class="sourceLineNo">2661</span>                        final PositionIterator pi = a.getPositionIterator(axis);<a name="line.2661"></a>
<span class="sourceLineNo">2662</span>                        final int[] pos = pi.getPos();<a name="line.2662"></a>
<span class="sourceLineNo">2663</span>                        final boolean[] hit = pi.getOmit();<a name="line.2663"></a>
<span class="sourceLineNo">2664</span>                        while (pi.hasNext()) {<a name="line.2664"></a>
<span class="sourceLineNo">2665</span>                                a.copyItemsFromAxes(pos, hit, src);<a name="line.2665"></a>
<span class="sourceLineNo">2666</span>                                centralDifference(src, dest);<a name="line.2666"></a>
<span class="sourceLineNo">2667</span>                                ds.setItemsOnAxes(pos, hit, dest.getBuffer());<a name="line.2667"></a>
<span class="sourceLineNo">2668</span>                        }<a name="line.2668"></a>
<span class="sourceLineNo">2669</span>                }<a name="line.2669"></a>
<span class="sourceLineNo">2670</span><a name="line.2670"></a>
<span class="sourceLineNo">2671</span>                return ds;<a name="line.2671"></a>
<span class="sourceLineNo">2672</span>        }<a name="line.2672"></a>
<span class="sourceLineNo">2673</span><a name="line.2673"></a>
<span class="sourceLineNo">2674</span>        /**<a name="line.2674"></a>
<span class="sourceLineNo">2675</span>         * 1st order discrete difference of dataset along flattened dataset using central difference<a name="line.2675"></a>
<span class="sourceLineNo">2676</span>         * @param a is 1d dataset<a name="line.2676"></a>
<span class="sourceLineNo">2677</span>         * @param out is 1d dataset<a name="line.2677"></a>
<span class="sourceLineNo">2678</span>         */<a name="line.2678"></a>
<span class="sourceLineNo">2679</span>        private static void centralDifference(final Dataset a, final Dataset out) {<a name="line.2679"></a>
<span class="sourceLineNo">2680</span>                final int isize = a.getElementsPerItem();<a name="line.2680"></a>
<span class="sourceLineNo">2681</span>                final int dt = a.getDType();<a name="line.2681"></a>
<span class="sourceLineNo">2682</span><a name="line.2682"></a>
<span class="sourceLineNo">2683</span>                final int nlen = (out.getShapeRef()[0] - 1)*isize;<a name="line.2683"></a>
<span class="sourceLineNo">2684</span>                if (nlen &lt; 1) {<a name="line.2684"></a>
<span class="sourceLineNo">2685</span>                        throw new IllegalArgumentException("Dataset should have a size &gt; 1 along given axis");<a name="line.2685"></a>
<span class="sourceLineNo">2686</span>                }<a name="line.2686"></a>
<span class="sourceLineNo">2687</span>                final IndexIterator it = a.getIterator();<a name="line.2687"></a>
<span class="sourceLineNo">2688</span>                if (!it.hasNext())<a name="line.2688"></a>
<span class="sourceLineNo">2689</span>                        return;<a name="line.2689"></a>
<span class="sourceLineNo">2690</span>                int oi = it.index;<a name="line.2690"></a>
<span class="sourceLineNo">2691</span>                if (!it.hasNext())<a name="line.2691"></a>
<span class="sourceLineNo">2692</span>                        return;<a name="line.2692"></a>
<span class="sourceLineNo">2693</span>                int pi = it.index;<a name="line.2693"></a>
<span class="sourceLineNo">2694</span><a name="line.2694"></a>
<span class="sourceLineNo">2695</span>                switch (dt) {<a name="line.2695"></a>
<span class="sourceLineNo">2696</span>                case Dataset.INT8:<a name="line.2696"></a>
<span class="sourceLineNo">2697</span>                        final byte[] i8data = ((ByteDataset) a).data;<a name="line.2697"></a>
<span class="sourceLineNo">2698</span>                        final byte[] oi8data = ((ByteDataset) out).getData();<a name="line.2698"></a>
<span class="sourceLineNo">2699</span>                        oi8data[0] = (byte) (i8data[pi] - i8data[oi]);<a name="line.2699"></a>
<span class="sourceLineNo">2700</span>                        for (int i = 1; it.hasNext(); i++) {<a name="line.2700"></a>
<span class="sourceLineNo">2701</span>                                oi8data[i] = (byte) ((i8data[it.index] - i8data[oi])/2);<a name="line.2701"></a>
<span class="sourceLineNo">2702</span>                                oi = pi;<a name="line.2702"></a>
<span class="sourceLineNo">2703</span>                                pi = it.index;<a name="line.2703"></a>
<span class="sourceLineNo">2704</span>                        }<a name="line.2704"></a>
<span class="sourceLineNo">2705</span>                        oi8data[nlen] = (byte) (i8data[pi] - i8data[oi]);<a name="line.2705"></a>
<span class="sourceLineNo">2706</span>                        break;<a name="line.2706"></a>
<span class="sourceLineNo">2707</span>                case Dataset.INT16:<a name="line.2707"></a>
<span class="sourceLineNo">2708</span>                        final short[] i16data = ((ShortDataset) a).data;<a name="line.2708"></a>
<span class="sourceLineNo">2709</span>                        final short[] oi16data = ((ShortDataset) out).getData();<a name="line.2709"></a>
<span class="sourceLineNo">2710</span>                        oi16data[0] = (short) (i16data[pi] - i16data[oi]);<a name="line.2710"></a>
<span class="sourceLineNo">2711</span>                        for (int i = 1; it.hasNext(); i++) {<a name="line.2711"></a>
<span class="sourceLineNo">2712</span>                                oi16data[i] = (short) ((i16data[it.index] - i16data[oi])/2);<a name="line.2712"></a>
<span class="sourceLineNo">2713</span>                                oi = pi;<a name="line.2713"></a>
<span class="sourceLineNo">2714</span>                                pi = it.index;<a name="line.2714"></a>
<span class="sourceLineNo">2715</span>                        }<a name="line.2715"></a>
<span class="sourceLineNo">2716</span>                        oi16data[nlen] = (short) (i16data[pi] - i16data[oi]);<a name="line.2716"></a>
<span class="sourceLineNo">2717</span>                        break;<a name="line.2717"></a>
<span class="sourceLineNo">2718</span>                case Dataset.INT32:<a name="line.2718"></a>
<span class="sourceLineNo">2719</span>                        final int[] i32data = ((IntegerDataset) a).data;<a name="line.2719"></a>
<span class="sourceLineNo">2720</span>                        final int[] oi32data = ((IntegerDataset) out).getData();<a name="line.2720"></a>
<span class="sourceLineNo">2721</span>                        oi32data[0] = i32data[pi] - i32data[oi];<a name="line.2721"></a>
<span class="sourceLineNo">2722</span>                        for (int i = 1; it.hasNext(); i++) {<a name="line.2722"></a>
<span class="sourceLineNo">2723</span>                                oi32data[i] = (i32data[it.index] - i32data[oi])/2;<a name="line.2723"></a>
<span class="sourceLineNo">2724</span>                                oi = pi;<a name="line.2724"></a>
<span class="sourceLineNo">2725</span>                                pi = it.index;<a name="line.2725"></a>
<span class="sourceLineNo">2726</span>                        }<a name="line.2726"></a>
<span class="sourceLineNo">2727</span>                        oi32data[nlen] = i32data[pi] - i32data[oi];<a name="line.2727"></a>
<span class="sourceLineNo">2728</span>                        break;<a name="line.2728"></a>
<span class="sourceLineNo">2729</span>                case Dataset.INT64:<a name="line.2729"></a>
<span class="sourceLineNo">2730</span>                        final long[] i64data = ((LongDataset) a).data;<a name="line.2730"></a>
<span class="sourceLineNo">2731</span>                        final long[] oi64data = ((LongDataset) out).getData();<a name="line.2731"></a>
<span class="sourceLineNo">2732</span>                        oi64data[0] = i64data[pi] - i64data[oi];<a name="line.2732"></a>
<span class="sourceLineNo">2733</span>                        for (int i = 1; it.hasNext(); i++) {<a name="line.2733"></a>
<span class="sourceLineNo">2734</span>                                oi64data[i] = (i64data[it.index] - i64data[oi])/2;<a name="line.2734"></a>
<span class="sourceLineNo">2735</span>                                oi = pi;<a name="line.2735"></a>
<span class="sourceLineNo">2736</span>                                pi = it.index;<a name="line.2736"></a>
<span class="sourceLineNo">2737</span>                        }<a name="line.2737"></a>
<span class="sourceLineNo">2738</span>                        oi64data[nlen] = i64data[pi] - i64data[oi];<a name="line.2738"></a>
<span class="sourceLineNo">2739</span>                        break;<a name="line.2739"></a>
<span class="sourceLineNo">2740</span>                case Dataset.ARRAYINT8:<a name="line.2740"></a>
<span class="sourceLineNo">2741</span>                        final byte[] ai8data = ((CompoundByteDataset) a).data;<a name="line.2741"></a>
<span class="sourceLineNo">2742</span>                        final byte[] oai8data = ((CompoundByteDataset) out).getData();<a name="line.2742"></a>
<span class="sourceLineNo">2743</span>                        for (int k = 0; k &lt; isize; k++) {<a name="line.2743"></a>
<span class="sourceLineNo">2744</span>                                oai8data[k] = (byte) (ai8data[pi+k] - ai8data[oi+k]);<a name="line.2744"></a>
<span class="sourceLineNo">2745</span>                        }<a name="line.2745"></a>
<span class="sourceLineNo">2746</span>                        for (int i = isize; it.hasNext();) {<a name="line.2746"></a>
<span class="sourceLineNo">2747</span>                                int l = it.index;<a name="line.2747"></a>
<span class="sourceLineNo">2748</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2748"></a>
<span class="sourceLineNo">2749</span>                                        oai8data[i++] = (byte) ((ai8data[l++] - ai8data[oi++])/2);<a name="line.2749"></a>
<span class="sourceLineNo">2750</span>                                }<a name="line.2750"></a>
<span class="sourceLineNo">2751</span>                                oi = pi;<a name="line.2751"></a>
<span class="sourceLineNo">2752</span>                                pi = it.index;<a name="line.2752"></a>
<span class="sourceLineNo">2753</span>                        }<a name="line.2753"></a>
<span class="sourceLineNo">2754</span>                        for (int k = 0; k &lt; isize; k++) {<a name="line.2754"></a>
<span class="sourceLineNo">2755</span>                                oai8data[nlen+k] = (byte) (ai8data[pi+k] - ai8data[oi+k]);<a name="line.2755"></a>
<span class="sourceLineNo">2756</span>                        }<a name="line.2756"></a>
<span class="sourceLineNo">2757</span>                        break;<a name="line.2757"></a>
<span class="sourceLineNo">2758</span>                case Dataset.ARRAYINT16:<a name="line.2758"></a>
<span class="sourceLineNo">2759</span>                        final short[] ai16data = ((CompoundShortDataset) a).data;<a name="line.2759"></a>
<span class="sourceLineNo">2760</span>                        final short[] oai16data = ((CompoundShortDataset) out).getData();<a name="line.2760"></a>
<span class="sourceLineNo">2761</span>                        for (int k = 0; k &lt; isize; k++) {<a name="line.2761"></a>
<span class="sourceLineNo">2762</span>                                oai16data[k] = (short) (ai16data[pi+k] - ai16data[oi+k]);<a name="line.2762"></a>
<span class="sourceLineNo">2763</span>                        }<a name="line.2763"></a>
<span class="sourceLineNo">2764</span>                        for (int i = isize; it.hasNext();) {<a name="line.2764"></a>
<span class="sourceLineNo">2765</span>                                int l = it.index;<a name="line.2765"></a>
<span class="sourceLineNo">2766</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2766"></a>
<span class="sourceLineNo">2767</span>                                        oai16data[i++] = (short) ((ai16data[l++] - ai16data[oi++])/2);<a name="line.2767"></a>
<span class="sourceLineNo">2768</span>                                }<a name="line.2768"></a>
<span class="sourceLineNo">2769</span>                                oi = pi;<a name="line.2769"></a>
<span class="sourceLineNo">2770</span>                                pi = it.index;<a name="line.2770"></a>
<span class="sourceLineNo">2771</span>                        }<a name="line.2771"></a>
<span class="sourceLineNo">2772</span>                        for (int k = 0; k &lt; isize; k++) {<a name="line.2772"></a>
<span class="sourceLineNo">2773</span>                                oai16data[nlen+k] = (short) (ai16data[pi+k] - ai16data[oi+k]);<a name="line.2773"></a>
<span class="sourceLineNo">2774</span>                        }<a name="line.2774"></a>
<span class="sourceLineNo">2775</span>                        break;<a name="line.2775"></a>
<span class="sourceLineNo">2776</span>                case Dataset.ARRAYINT32:<a name="line.2776"></a>
<span class="sourceLineNo">2777</span>                        final int[] ai32data = ((CompoundIntegerDataset) a).data;<a name="line.2777"></a>
<span class="sourceLineNo">2778</span>                        final int[] oai32data = ((CompoundIntegerDataset) out).getData();<a name="line.2778"></a>
<span class="sourceLineNo">2779</span>                        for (int k = 0; k &lt; isize; k++) {<a name="line.2779"></a>
<span class="sourceLineNo">2780</span>                                oai32data[k] = ai32data[pi+k] - ai32data[oi+k];<a name="line.2780"></a>
<span class="sourceLineNo">2781</span>                        }<a name="line.2781"></a>
<span class="sourceLineNo">2782</span>                        for (int i = isize; it.hasNext();) {<a name="line.2782"></a>
<span class="sourceLineNo">2783</span>                                int l = it.index;<a name="line.2783"></a>
<span class="sourceLineNo">2784</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2784"></a>
<span class="sourceLineNo">2785</span>                                        oai32data[i++] = (ai32data[l++] - ai32data[oi++])/2;<a name="line.2785"></a>
<span class="sourceLineNo">2786</span>                                }<a name="line.2786"></a>
<span class="sourceLineNo">2787</span>                                oi = pi;<a name="line.2787"></a>
<span class="sourceLineNo">2788</span>                                pi = it.index;<a name="line.2788"></a>
<span class="sourceLineNo">2789</span>                        }<a name="line.2789"></a>
<span class="sourceLineNo">2790</span>                        for (int k = 0; k &lt; isize; k++) {<a name="line.2790"></a>
<span class="sourceLineNo">2791</span>                                oai32data[nlen+k] = ai32data[pi+k] - ai32data[oi+k];<a name="line.2791"></a>
<span class="sourceLineNo">2792</span>                        }<a name="line.2792"></a>
<span class="sourceLineNo">2793</span>                        break;<a name="line.2793"></a>
<span class="sourceLineNo">2794</span>                case Dataset.ARRAYINT64:<a name="line.2794"></a>
<span class="sourceLineNo">2795</span>                        final long[] ai64data = ((CompoundLongDataset) a).data;<a name="line.2795"></a>
<span class="sourceLineNo">2796</span>                        final long[] oai64data = ((CompoundLongDataset) out).getData();<a name="line.2796"></a>
<span class="sourceLineNo">2797</span>                        for (int k = 0; k &lt; isize; k++) {<a name="line.2797"></a>
<span class="sourceLineNo">2798</span>                                oai64data[k] = ai64data[pi+k] - ai64data[oi+k];<a name="line.2798"></a>
<span class="sourceLineNo">2799</span>                        }<a name="line.2799"></a>
<span class="sourceLineNo">2800</span>                        for (int i = isize; it.hasNext();) {<a name="line.2800"></a>
<span class="sourceLineNo">2801</span>                                int l = it.index;<a name="line.2801"></a>
<span class="sourceLineNo">2802</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2802"></a>
<span class="sourceLineNo">2803</span>                                        oai64data[i++] = (ai64data[l++] - ai64data[oi++])/2;<a name="line.2803"></a>
<span class="sourceLineNo">2804</span>                                }<a name="line.2804"></a>
<span class="sourceLineNo">2805</span>                                oi = pi;<a name="line.2805"></a>
<span class="sourceLineNo">2806</span>                                pi = it.index;<a name="line.2806"></a>
<span class="sourceLineNo">2807</span>                        }<a name="line.2807"></a>
<span class="sourceLineNo">2808</span>                        for (int k = 0; k &lt; isize; k++) {<a name="line.2808"></a>
<span class="sourceLineNo">2809</span>                                oai64data[nlen+k] = ai64data[pi+k] - ai64data[oi+k];<a name="line.2809"></a>
<span class="sourceLineNo">2810</span>                        }<a name="line.2810"></a>
<span class="sourceLineNo">2811</span>                        break;<a name="line.2811"></a>
<span class="sourceLineNo">2812</span>                case Dataset.FLOAT32:<a name="line.2812"></a>
<span class="sourceLineNo">2813</span>                        final float[] f32data = ((FloatDataset) a).data;<a name="line.2813"></a>
<span class="sourceLineNo">2814</span>                        final float[] of32data = ((FloatDataset) out).getData();<a name="line.2814"></a>
<span class="sourceLineNo">2815</span>                        of32data[0] = f32data[pi] - f32data[oi];<a name="line.2815"></a>
<span class="sourceLineNo">2816</span>                        for (int i = 1; it.hasNext(); i++) {<a name="line.2816"></a>
<span class="sourceLineNo">2817</span>                                of32data[i] = (f32data[it.index] - f32data[oi])*0.5f;<a name="line.2817"></a>
<span class="sourceLineNo">2818</span>                                oi = pi;<a name="line.2818"></a>
<span class="sourceLineNo">2819</span>                                pi = it.index;<a name="line.2819"></a>
<span class="sourceLineNo">2820</span>                        }<a name="line.2820"></a>
<span class="sourceLineNo">2821</span>                        of32data[nlen] = f32data[pi] - f32data[oi];<a name="line.2821"></a>
<span class="sourceLineNo">2822</span>                        break;<a name="line.2822"></a>
<span class="sourceLineNo">2823</span>                case Dataset.FLOAT64:<a name="line.2823"></a>
<span class="sourceLineNo">2824</span>                        final double[] f64data = ((DoubleDataset) a).data;<a name="line.2824"></a>
<span class="sourceLineNo">2825</span>                        final double[] of64data = ((DoubleDataset) out).getData();<a name="line.2825"></a>
<span class="sourceLineNo">2826</span>                        of64data[0] = f64data[pi] - f64data[oi];<a name="line.2826"></a>
<span class="sourceLineNo">2827</span>                        for (int i = 1; it.hasNext(); i++) {<a name="line.2827"></a>
<span class="sourceLineNo">2828</span>                                of64data[i] = (f64data[it.index] - f64data[oi])*0.5f;<a name="line.2828"></a>
<span class="sourceLineNo">2829</span>                                oi = pi;<a name="line.2829"></a>
<span class="sourceLineNo">2830</span>                                pi = it.index;<a name="line.2830"></a>
<span class="sourceLineNo">2831</span>                        }<a name="line.2831"></a>
<span class="sourceLineNo">2832</span>                        of64data[nlen] = f64data[pi] - f64data[oi];<a name="line.2832"></a>
<span class="sourceLineNo">2833</span>                        break;<a name="line.2833"></a>
<span class="sourceLineNo">2834</span>                case Dataset.COMPLEX64:<a name="line.2834"></a>
<span class="sourceLineNo">2835</span>                        final float[] c64data = ((ComplexFloatDataset) a).data;<a name="line.2835"></a>
<span class="sourceLineNo">2836</span>                        final float[] oc64data = ((ComplexFloatDataset) out).getData();<a name="line.2836"></a>
<span class="sourceLineNo">2837</span>                        oc64data[0] = c64data[pi] - c64data[oi];<a name="line.2837"></a>
<span class="sourceLineNo">2838</span>                        oc64data[1] = c64data[pi+1] - c64data[oi+1];<a name="line.2838"></a>
<span class="sourceLineNo">2839</span>                        for (int i = 2; it.hasNext();) {<a name="line.2839"></a>
<span class="sourceLineNo">2840</span>                                oc64data[i++] = (c64data[it.index] - c64data[oi++])*0.5f;<a name="line.2840"></a>
<span class="sourceLineNo">2841</span>                                oc64data[i++] = (c64data[it.index + 1] - c64data[oi])*0.5f;<a name="line.2841"></a>
<span class="sourceLineNo">2842</span>                                oi = pi;<a name="line.2842"></a>
<span class="sourceLineNo">2843</span>                                pi = it.index;<a name="line.2843"></a>
<span class="sourceLineNo">2844</span>                        }<a name="line.2844"></a>
<span class="sourceLineNo">2845</span>                        oc64data[nlen] = c64data[pi] - c64data[oi];<a name="line.2845"></a>
<span class="sourceLineNo">2846</span>                        oc64data[nlen+1] = c64data[pi+1] - c64data[oi+1];<a name="line.2846"></a>
<span class="sourceLineNo">2847</span>                        break;<a name="line.2847"></a>
<span class="sourceLineNo">2848</span>                case Dataset.COMPLEX128:<a name="line.2848"></a>
<span class="sourceLineNo">2849</span>                        final double[] c128data = ((ComplexDoubleDataset) a).data;<a name="line.2849"></a>
<span class="sourceLineNo">2850</span>                        final double[] oc128data = ((ComplexDoubleDataset) out).getData();<a name="line.2850"></a>
<span class="sourceLineNo">2851</span>                        oc128data[0] = c128data[pi] - c128data[oi];<a name="line.2851"></a>
<span class="sourceLineNo">2852</span>                        oc128data[1] = c128data[pi+1] - c128data[oi+1];<a name="line.2852"></a>
<span class="sourceLineNo">2853</span>                        for (int i = 2; it.hasNext();) {<a name="line.2853"></a>
<span class="sourceLineNo">2854</span>                                oc128data[i++] = (c128data[it.index] - c128data[oi++])*0.5f;<a name="line.2854"></a>
<span class="sourceLineNo">2855</span>                                oc128data[i++] = (c128data[it.index + 1] - c128data[oi])*0.5f;<a name="line.2855"></a>
<span class="sourceLineNo">2856</span>                                oi = pi;<a name="line.2856"></a>
<span class="sourceLineNo">2857</span>                                pi = it.index;<a name="line.2857"></a>
<span class="sourceLineNo">2858</span>                        }<a name="line.2858"></a>
<span class="sourceLineNo">2859</span>                        oc128data[nlen] = c128data[pi] - c128data[oi];<a name="line.2859"></a>
<span class="sourceLineNo">2860</span>                        oc128data[nlen+1] = c128data[pi+1] - c128data[oi+1];<a name="line.2860"></a>
<span class="sourceLineNo">2861</span>                        break;<a name="line.2861"></a>
<span class="sourceLineNo">2862</span>                case Dataset.ARRAYFLOAT32:<a name="line.2862"></a>
<span class="sourceLineNo">2863</span>                        final float[] af32data = ((CompoundFloatDataset) a).data;<a name="line.2863"></a>
<span class="sourceLineNo">2864</span>                        final float[] oaf32data = ((CompoundFloatDataset) out).getData();<a name="line.2864"></a>
<span class="sourceLineNo">2865</span>                        for (int k = 0; k &lt; isize; k++) {<a name="line.2865"></a>
<span class="sourceLineNo">2866</span>                                oaf32data[k] = af32data[pi+k] - af32data[oi+k];<a name="line.2866"></a>
<span class="sourceLineNo">2867</span>                        }<a name="line.2867"></a>
<span class="sourceLineNo">2868</span>                        for (int i = isize; it.hasNext();) {<a name="line.2868"></a>
<span class="sourceLineNo">2869</span>                                int l = it.index;<a name="line.2869"></a>
<span class="sourceLineNo">2870</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2870"></a>
<span class="sourceLineNo">2871</span>                                        oaf32data[i++] = (af32data[l++] - af32data[oi++])*0.5f;<a name="line.2871"></a>
<span class="sourceLineNo">2872</span>                                }<a name="line.2872"></a>
<span class="sourceLineNo">2873</span>                                oi = pi;<a name="line.2873"></a>
<span class="sourceLineNo">2874</span>                                pi = it.index;<a name="line.2874"></a>
<span class="sourceLineNo">2875</span>                        }<a name="line.2875"></a>
<span class="sourceLineNo">2876</span>                        for (int k = 0; k &lt; isize; k++) {<a name="line.2876"></a>
<span class="sourceLineNo">2877</span>                                oaf32data[nlen+k] = af32data[pi+k] - af32data[oi+k];<a name="line.2877"></a>
<span class="sourceLineNo">2878</span>                        }<a name="line.2878"></a>
<span class="sourceLineNo">2879</span>                        break;<a name="line.2879"></a>
<span class="sourceLineNo">2880</span>                case Dataset.ARRAYFLOAT64:<a name="line.2880"></a>
<span class="sourceLineNo">2881</span>                        final double[] af64data = ((CompoundDoubleDataset) a).data;<a name="line.2881"></a>
<span class="sourceLineNo">2882</span>                        final double[] oaf64data = ((CompoundDoubleDataset) out).getData();<a name="line.2882"></a>
<span class="sourceLineNo">2883</span>                        for (int k = 0; k &lt; isize; k++) {<a name="line.2883"></a>
<span class="sourceLineNo">2884</span>                                oaf64data[k] = af64data[pi+k] - af64data[oi+k];<a name="line.2884"></a>
<span class="sourceLineNo">2885</span>                        }<a name="line.2885"></a>
<span class="sourceLineNo">2886</span>                        for (int i = isize; it.hasNext();) {<a name="line.2886"></a>
<span class="sourceLineNo">2887</span>                                int l = it.index;<a name="line.2887"></a>
<span class="sourceLineNo">2888</span>                                for (int k = 0; k &lt; isize; k++) {<a name="line.2888"></a>
<span class="sourceLineNo">2889</span>                                        oaf64data[i++] = (af64data[l++] - af64data[oi++])*0.5;<a name="line.2889"></a>
<span class="sourceLineNo">2890</span>                                }<a name="line.2890"></a>
<span class="sourceLineNo">2891</span>                                oi = pi;<a name="line.2891"></a>
<span class="sourceLineNo">2892</span>                                pi = it.index;<a name="line.2892"></a>
<span class="sourceLineNo">2893</span>                        }<a name="line.2893"></a>
<span class="sourceLineNo">2894</span>                        for (int k = 0; k &lt; isize; k++) {<a name="line.2894"></a>
<span class="sourceLineNo">2895</span>                                oaf64data[nlen+k] = af64data[pi+k] - af64data[oi+k];<a name="line.2895"></a>
<span class="sourceLineNo">2896</span>                        }<a name="line.2896"></a>
<span class="sourceLineNo">2897</span>                        break;<a name="line.2897"></a>
<span class="sourceLineNo">2898</span>                default:<a name="line.2898"></a>
<span class="sourceLineNo">2899</span>                        throw new UnsupportedOperationException("difference does not support this dataset type");<a name="line.2899"></a>
<span class="sourceLineNo">2900</span>                }<a name="line.2900"></a>
<span class="sourceLineNo">2901</span>        }<a name="line.2901"></a>
<span class="sourceLineNo">2902</span><a name="line.2902"></a>
<span class="sourceLineNo">2903</span>        /**<a name="line.2903"></a>
<span class="sourceLineNo">2904</span>         * Calculate gradient (or partial derivatives) by central difference<a name="line.2904"></a>
<span class="sourceLineNo">2905</span>         * @param y<a name="line.2905"></a>
<span class="sourceLineNo">2906</span>         * @param x one or more datasets for dependent variables<a name="line.2906"></a>
<span class="sourceLineNo">2907</span>         * @return a list of datasets (one for each dimension in y)<a name="line.2907"></a>
<span class="sourceLineNo">2908</span>         */<a name="line.2908"></a>
<span class="sourceLineNo">2909</span>        public static List&lt;Dataset&gt; gradient(Dataset y, Dataset... x) {<a name="line.2909"></a>
<span class="sourceLineNo">2910</span>                final int rank = y.getRank();<a name="line.2910"></a>
<span class="sourceLineNo">2911</span><a name="line.2911"></a>
<span class="sourceLineNo">2912</span>                if (x.length &gt; 0) {<a name="line.2912"></a>
<span class="sourceLineNo">2913</span>                        if (x.length != rank) {<a name="line.2913"></a>
<span class="sourceLineNo">2914</span>                                throw new IllegalArgumentException("Number of dependent datasets must be equal to rank of first argument");<a name="line.2914"></a>
<span class="sourceLineNo">2915</span>                        }<a name="line.2915"></a>
<span class="sourceLineNo">2916</span>                        for (int a = 0; a &lt; rank; a++) {<a name="line.2916"></a>
<span class="sourceLineNo">2917</span>                                int rx = x[a].getRank();<a name="line.2917"></a>
<span class="sourceLineNo">2918</span>                                if (rx != rank &amp;&amp; rx != 1) {<a name="line.2918"></a>
<span class="sourceLineNo">2919</span>                                        throw new IllegalArgumentException("Dependent datasets must be 1-D or match rank of first argument");<a name="line.2919"></a>
<span class="sourceLineNo">2920</span>                                }<a name="line.2920"></a>
<span class="sourceLineNo">2921</span>                                if (rx == 1) {<a name="line.2921"></a>
<span class="sourceLineNo">2922</span>                                        if (y.getShapeRef()[a] != x[a].getShapeRef()[0]) {<a name="line.2922"></a>
<span class="sourceLineNo">2923</span>                                                throw new IllegalArgumentException("Length of dependent dataset must match axis length");<a name="line.2923"></a>
<span class="sourceLineNo">2924</span>                                        }<a name="line.2924"></a>
<span class="sourceLineNo">2925</span>                                } else {<a name="line.2925"></a>
<span class="sourceLineNo">2926</span>                                        y.checkCompatibility(x[a]);<a name="line.2926"></a>
<span class="sourceLineNo">2927</span>                                }<a name="line.2927"></a>
<span class="sourceLineNo">2928</span>                        }<a name="line.2928"></a>
<span class="sourceLineNo">2929</span>                }<a name="line.2929"></a>
<span class="sourceLineNo">2930</span><a name="line.2930"></a>
<span class="sourceLineNo">2931</span>                List&lt;Dataset&gt; grad = new ArrayList&lt;Dataset&gt;(rank);<a name="line.2931"></a>
<span class="sourceLineNo">2932</span><a name="line.2932"></a>
<span class="sourceLineNo">2933</span>                for (int a = 0; a &lt; rank; a++) {<a name="line.2933"></a>
<span class="sourceLineNo">2934</span>                        Dataset g = centralDifference(y, a);<a name="line.2934"></a>
<span class="sourceLineNo">2935</span>                        grad.add(g);<a name="line.2935"></a>
<span class="sourceLineNo">2936</span>                }<a name="line.2936"></a>
<span class="sourceLineNo">2937</span><a name="line.2937"></a>
<span class="sourceLineNo">2938</span>                if (x.length &gt; 0) {<a name="line.2938"></a>
<span class="sourceLineNo">2939</span>                        for (int a = 0; a &lt; rank; a++) {<a name="line.2939"></a>
<span class="sourceLineNo">2940</span>                                Dataset g = grad.get(a);<a name="line.2940"></a>
<span class="sourceLineNo">2941</span>                                Dataset dx = x[a];<a name="line.2941"></a>
<span class="sourceLineNo">2942</span>                                int r = dx.getRank();<a name="line.2942"></a>
<span class="sourceLineNo">2943</span>                                if (r == rank) {<a name="line.2943"></a>
<span class="sourceLineNo">2944</span>                                        g.idivide(centralDifference(dx, a));<a name="line.2944"></a>
<span class="sourceLineNo">2945</span>                                } else {<a name="line.2945"></a>
<span class="sourceLineNo">2946</span>                                        final int dt = dx.getDType();<a name="line.2946"></a>
<span class="sourceLineNo">2947</span>                                        final int is = dx.getElementsPerItem();<a name="line.2947"></a>
<span class="sourceLineNo">2948</span>                                        @SuppressWarnings("deprecation")<a name="line.2948"></a>
<span class="sourceLineNo">2949</span>                                        final Dataset bdx = DatasetFactory.zeros(is, y.getShapeRef(), dt);<a name="line.2949"></a>
<span class="sourceLineNo">2950</span>                                        final PositionIterator pi = y.getPositionIterator(a);<a name="line.2950"></a>
<span class="sourceLineNo">2951</span>                                        final int[] pos = pi.getPos();<a name="line.2951"></a>
<span class="sourceLineNo">2952</span>                                        final boolean[] hit = pi.getOmit();<a name="line.2952"></a>
<span class="sourceLineNo">2953</span>                                        dx = centralDifference(dx, 0);<a name="line.2953"></a>
<span class="sourceLineNo">2954</span><a name="line.2954"></a>
<span class="sourceLineNo">2955</span>                                        while (pi.hasNext()) {<a name="line.2955"></a>
<span class="sourceLineNo">2956</span>                                                bdx.setItemsOnAxes(pos, hit, dx.getBuffer());<a name="line.2956"></a>
<span class="sourceLineNo">2957</span>                                        }<a name="line.2957"></a>
<span class="sourceLineNo">2958</span>                                        g.idivide(bdx);<a name="line.2958"></a>
<span class="sourceLineNo">2959</span>                                }<a name="line.2959"></a>
<span class="sourceLineNo">2960</span>                        }<a name="line.2960"></a>
<span class="sourceLineNo">2961</span>                }<a name="line.2961"></a>
<span class="sourceLineNo">2962</span>                return grad;<a name="line.2962"></a>
<span class="sourceLineNo">2963</span>        }<a name="line.2963"></a>
<span class="sourceLineNo">2964</span>}<a name="line.2964"></a>




























































</pre>
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